Within Mirages
When One Object Becomes a Stack of Shapes
Fata Morgana mirages can stretch, invert and duplicate parts of one distant object until its original shape becomes difficult to recognize.
On this page
- How alternating upright and inverted images form
- Why compressed and enlarged zones change familiar shapes
- How changing layers can make the image seem to transform
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Introduction
A Fata Morgana can turn one real, distant object into what looks like a stack of unrelated shapes. Instead of merely shifting a ship, island or aircraft upwards, this extreme form of superior mirage can produce several vertically arranged images of the same target, with upright and inverted sections alternating. At the same time, some bands may be greatly stretched while neighbouring bands are squeezed almost flat. The result can bear surprisingly little resemblance to the source.[A Green Flash Page]aty.sdsu.eduA Green Flash Page Fata MorganaA Green Flash Page Fata Morgana
That combination matters when assessing UFO or UAP reports near a distant horizon. A witness need not mistake an intact ship for a flying ship: atmospheric refraction can dismantle the familiar visual outline itself. Masts, hulls, coastline features or other parts of a distant target may be duplicated and magnified into columns, horizontal bars and irregular blocks, while other portions effectively disappear through severe compression. Because the refracting layers can change on short timescales, the resulting form can also appear to transform while being watched.[A Green Flash Page]aty.sdsu.eduA Green Flash Page Atmospheric Optics GlossaryA Green Flash Page Atmospheric Optics Glossary
How one object becomes several images
Fata Morgana is best understood not as the atmosphere creating several independent objects, but as several optical routes carrying light from the same object to the observer. Strong temperature stratification can establish a refracting duct near the horizon. Rays leaving different parts of a distant target then follow curved trajectories through the changing refractive index of the air. Under sufficiently strong conditions, more than one family of rays from the same target region can reach the observer.[A Green Flash Page]aty.sdsu.eduA Green Flash Page Mirages and Green FlashesA Green Flash Page Mirages and Green Flashes
The simplest useful comparison is a three-image superior mirage. It normally consists of an inverted image sandwiched between two upright images, although the upper upright image may be so vertically compressed that it is difficult to see. Fata Morgana takes this multiplication further: additional ray paths and image folds can produce five or even more images of portions of a target. Atmospheric-optics simulations show that some target regions can be imaged four, five or six times under suitable duct geometries.[A Green Flash Page]aty.sdsu.eduA Green Flash Page Types of MiragesA Green Flash Page Types of Mirages
The important feature is the ordering. Upright and inverted images generally alternate vertically. A feature on a distant ship might therefore appear once upright, again upside down immediately above it and then upright again higher still. Photographed superior mirages of ships show exactly this structure: an inverted vessel can appear above the lower image while parts of a third, upright image occur above the inverted one.[Atmospheric Optics]atoptics.org.ukAtmospheric Optics Strange Ships, Superior MiragesAtmospheric Optics Strange Ships, Superior Mirages
This is why descriptions such as “multiple objects” can be misleading. Several apparent components separated vertically in the observer’s view may actually be different images—or different pieces of images—of a single physical target. Refraction primarily rearranges them in the vertical plane, so the repetitions tend to form a stack rather than appearing randomly across the sky.[A Green Flash Page]aty.sdsu.eduA Green Flash Page Mirages and Green FlashesA Green Flash Page Mirages and Green Flashes
Why familiar shapes become towers, bars and blocks
Multiplication alone does not explain the strangest Fata Morgana appearances. The atmosphere also changes the vertical scale of different parts of the image.
Where neighbouring incoming rays correspond to a very small vertical portion of the real target, that portion can be spread over a much larger angle in the observer’s field of view. It consequently appears enormously stretched or “towered”. Elsewhere the opposite happens: a comparatively large section of the real object is mapped into a narrow apparent band and becomes strongly compressed. Detailed atmospheric-optics modelling describes these transitions as image folding, with very large vertical magnification possible close to the folds.[A Green Flash Page]aty.sdsu.eduA Green Flash Page Wegener's Mirage ModelA Green Flash Page Wegener's Mirage Model
The visible target therefore becomes a sequence of alternating transformations. One part can retain roughly recognisable proportions; the next may be squeezed into a thin line; another can be stretched into a tall pillar; and another may be inverted and repeated. Experimental work on Fata Morgana imaging has likewise reproduced extension, contraction, inversion and overlapping multiple images using controlled refractive-index gradients.[BNU]dxwl.bnu.edu.cnBNUFormation mechanism and reappearance experiment of Fata Morgana phenomenonBNUFormation mechanism and reappearance experiment of Fata Morgana phenomenon
This explains one of the phenomenon’s characteristic visual signatures: false architecture. Atmospheric-optics specialist Andrew Young notes that alternating zones of compression and extension can produce apparent buildings and rows of features, while duplicated landscape slopes can form narrow horizontal projections. Historical observers interpreted such patterns as balconies, arches, aqueducts, towers and other structures even though the source was ordinary distant terrain.[A Green Flash Page]aty.sdsu.eduA Green Flash Page Fata MorganaA Green Flash Page Fata Morgana
The effect is especially deceptive when the source already contains strong edges. A ship, for example, supplies a hull, deck, bridge, funnels and masts for the mirage to rearrange. Once selected sections have been inverted, duplicated and stretched while others have been compressed, recognising the original vessel from its overall silhouette may become extremely difficult. Aviation-oriented guidance on Fata Morgana accordingly notes that the underlying object can become effectively unrecognisable.[Skybrary]skybrary.aeroFata Morgana | SKYbrary Aviation SafetyFata Morgana | SKYbrary Aviation Safety…
That distinction is important for unusual aerial observations. A Fata Morgana does not have to produce a clean, photograph-like duplicate of its source. The more extreme displays can instead leave the observer looking at an apparently airborne arrangement of columns, slabs, spikes or dark and bright patches whose connection with a distant surface object is no longer obvious.
Why the shape can transform while watched
Fata Morgana is also unusually dynamic. The refractive structure responsible for the image depends on the vertical temperature and density profile along a long, shallow path through the atmosphere. Small changes in that structure alter which ray paths connect the distant target with the observer. Consequently, image folds shift, magnification changes and additional images can appear or disappear.[A Green Flash Page]aty.sdsu.eduA Green Flash Page Fata MorganaA Green Flash Page Fata Morgana
Photographic sequences demonstrate that this is not merely theoretical. In one documented Fata Morgana sequence discussed by Young, a three-image structure developed into a five-image structure in less than two minutes; visible changes were already apparent between frames separated by roughly one minute. A separate sequence of the Farallon Islands recorded a superior mirage changing between three-, five- and two-image configurations within six minutes.[A Green Flash Page]aty.sdsu.eduA Green Flash Page Fata MorganaA Green Flash Page Fata Morgana
A longer sequence across Monterey Bay provides another useful example. Over 33 minutes, a miraged shoreline progressed from a relatively ordinary superior mirage towards three and then five visible images, with stretched and compressed bands developing during the transition. The underlying coastline had not changed, but the atmospheric optical system through which it was being viewed had.[Wikimedia Commons]commons.wikimedia.orgCommons File:Scm gif fullsize q10.ogvCommons File:Scm gif fullsize q10.ogv
A striking modern example was reported off Cornwall during the 2026 heatwave. A distant vessel identified as an aircraft carrier reportedly changed from something resembling tall fuzzy towers into several distorted horizon-like forms and then other unfamiliar silhouettes. Contemporary reporting attributed the extraordinary changes to a Fata Morgana produced over cold sea beneath much warmer air. Whatever resemblance individual moments suggested to observers, the useful diagnostic feature is the sequence: a distant real target repeatedly changed apparent geometry as the refracting atmosphere changed.[The Times]thetimes.comThe Times Seeing is believingThe Times Seeing is believing
The apparent “transformation” therefore need not represent movement or structural change in the source. It can instead be a succession of different optical mappings of the same source. One minute a stretched section dominates; moments later it contracts while a duplicated inverted section becomes prominent. To an observer without a clear view of the original target, that can look less like a distorted ship or coastline than an unfamiliar object altering its shape.
The source can be much more ordinary than the image
One reason Fata Morgana deserves particular attention in horizon-level UFO and UAP identification is the mismatch it can create between source identity and apparent morphology. The source can remain a conventional distant object while its displayed image loses the cues normally used to recognise it.
This does not mean that every “hovering ship”, elongated light or shape-changing horizon object is a Fata Morgana. Indeed, atmospheric-optics terminology is sometimes applied too loosely: a relatively simple elevation or duplication of a distant vessel may be an ordinary superior mirage rather than the complex multiple-image display properly associated with Fata Morgana. Strong distortion, alternating upright and inverted images, repeated features and conspicuous zones of vertical stretching and compression provide much stronger evidence for the complex phenomenon.[A Green Flash Page]aty.sdsu.eduA Green Flash Page Types of MiragesA Green Flash Page Types of Mirages
Nor should picturesque historical descriptions be interpreted literally. Accounts of mirages producing castles, armies or elaborate buildings often contain an element of human visual interpretation. Young specifically cautions against treating such descriptions as literal optical reproductions. The physical phenomenon supplies distorted edges, repeated features and quasi-architectural patterns; perception supplies the familiar object that those patterns seem to resemble.[A Green Flash Page]aty.sdsu.eduA Green Flash Page Fata MorganaA Green Flash Page Fata Morgana
For an unexplained aerial report, therefore, the strongest Fata Morgana pattern is not simply “something strange was seen near water”. It is a more specific combination: a very distant target close to the horizon; strong refractive conditions; vertical multiplication or inversion; severe stretching and compression; and apparent structural changes occurring while the target remains in roughly the same horizon region. That combination is capable of turning one mundane source into several apparently separate—and temporarily unrecognisable—shapes.[edu.cn]dxwl.bnu.edu.cnBNUFormation mechanism and reappearance experiment of Fata Morgana phenomenonBNUFormation mechanism and reappearance experiment of Fata Morgana phenomenon
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Endnotes
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Additional References
42.
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Title: Fata morgana of the sea surface, with mirage of a boat and mirage of [birds]({{ ‘birds/’ | relative_url }})
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Source snippet
Time lapse of fast changing Fata Morgana of Farallon Islands...
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