GESTALTZERFALL
noun
\ gəˈʃtælttsɛɐ̯ˈfal \

: a type of visual agnosia and is a known psychological phenomenon where delays in recognition are observed when a complex shape is stared at for a while as the shape seems to decompose into its constituting parts

from the German gestaltzerfall, from gestalt- (shape) + -zerfall (decomposition)