Physical illusion

Physical illusion

For example, a mirage or the Doppler effect

since August 1, 2010

"Underestimation of the thickness of an acrylic block"

This is acrylic for windows of an aquarium "Kaiyukan", Osaka, Japan.

"Illusion that the sun appears to be orange"

The color temperature of the sun is 6500K (white) but the sun in this photo appears to be orange. This can be an "illusion".

"Illusion that letters appear to be larger"

Letters appear to be larger through a convex lens, though the physical size is constant.

"Moiré with the Enigma illusion and subjective color"

Moiré is occasionally regarded as illusion.

"Geomagnetism"

Moiré is occasionally regarded as illusion.