One of Akiyoshi Kitaoka's recent work that I found absolutely stunning is the following illusion where a ring of one colour appears to be either in front of or behind two rings of another colour:
To my perception, the blue ring appears to float above the red rings. It feels a bit like an autostereogram where a 3-dimensional image emerges out of a 2-dimensional image. However, there is no autostereogram in this image and there is no crossing of eyes involved. The 3-dimensional image arises out of an otherwise plain image of differently coloured rings on a dark background.
https://twitter.com/AkiyoshiKitaoka/status/16812686184854568...
https://nitter.net/AkiyoshiKitaoka/status/168126861848545689...
To my perception, the blue ring appears to float above the red rings. It feels a bit like an autostereogram where a 3-dimensional image emerges out of a 2-dimensional image. However, there is no autostereogram in this image and there is no crossing of eyes involved. The 3-dimensional image arises out of an otherwise plain image of differently coloured rings on a dark background.
An analysis of this illusion is available here: http://www.psy.ritsumei.ac.jp/~akitaoka/Kitaoka2015_Referenc...