Picrel is an image that doesn’t have any identifiable objects.
Due to how we organize objects and constructs, the brain tries to fill in the gaps of any given input. However, with an image like this, the brain seems to fail. Are there any other images/ideas that give the same effect?
Also see
>blindsight
A book. One of the extinct species has a similar, though more extreme, reaction to right angles, leading to involuntary seizures.