Optical Illusions

http://somethingorotherwhatever.com/truchet-polygons/ Truchet Polygons

Each tile is a regular polygon with an even number of sides. The vertices are painted in alternating colours. The tiles are lined up so that the colours on every edge match.

https://en.wikipedia.org/wiki/Fata_Morgana_(mirage)

Fata Morgana mirages significantly distort the object or objects on which they are based, often such that the object is completely unrecognizable. A Fata Morgana may be seen on land or at sea, in polar regions, or in deserts. It may involve almost any kind of distant object, including boats, islands, and the coastline.

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