Physical illusion
For example, a mirage or the Doppler effect
since August 1, 2010
@Nijitani, Tokushima, Japan, October 26, 2020
Copyright Akiyoshi Kitaoka 2020 (Novenber 21)
"Shape illusion of the sun close to the horizon illusion"
The sun appears to be compressed vertically (0.86 : 1.00).
Copyright Akiyoshi Kitaoka 2014 (September 14)
The sun appears to be compressed vertically (0.90 : 1.00).
90-deg rotation apparently enhances this effect due to the vertical-horizontal illusion.
"Inferior mirage or road mirage observed in Tokamachi, Niigata, Japan"
There appear to be water on the road though there is not.
Copyright Akiyoshi Kitaoka 2013 (August 15)
Photo taken August 15, 2013
"Inferior mirage or road mirage observed in Tsunan, Niigata, Japan"
There appear to be water on the road though there is not.
Copyright Akiyoshi Kitaoka 2013 (August 15)
Photo taken August 15, 2013
"Inferior mirage or road mirage observed in Northern Kyoto"
There appear to be water on the road though there is not.
Copyright Akiyoshi Kitaoka 2013 (March 24)
Photo taken March 24, 2013
There is no water.
The opposite view
There is no water, either.
"Underestimation of the thickness of an acrylic block"
This is acrylic for windows of an aquarium "Kaiyukan", Osaka, Japan.
Copyright Akiyoshi Kitaoka 2010 (August 1)
"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".
Copyright Akiyoshi Kitaoka 2010 (August 1)
"Illusion that letters appear to be larger"
Letters appear to be larger through a convex lens, though the physical size is constant.
Copyright Akiyoshi Kitaoka 2010 (August 1)
"Moiré with the Enigma illusion and subjective color"
Moiré is occasionally regarded as illusion.
Copyright Akiyoshi Kitaoka 2010 (August 1)
"Geomagnetism"
Moiré is occasionally regarded as illusion.
Copyright Akiyoshi Kitaoka 2010 (August 1)