created 2025-05-30, & modified, =this.modified
The Necker cube is an optical illusion of a rhomboid by crystallographer Louis Albert Necker in 1832.
It is a simple wireframe which, lacking visual cues, can be seen as either a lower-left or upper-right square as its front side.
The human visual system picks an interpretation of each part that makes the whole consistent.
The Necker cube has shed light on the human visual system. The phenomenon has served as evidence of the human brain being a neural network with two distinct equally possible interchangeable stable states