出典:Wikipedia
出典:『Wikipedia』 (2011/07/27 07:47 UTC 版)
An isometric illusion (also called an ambiguous figure or inside/outside illusion) is a type of optical illusion, specifically one due to multistable perception. In general, any shape built entirely of same-length (i.e., isometric) lines that does not clearly indicate relative direction between its components will evoke such a perceptual "flip-flopping".