In detail

Disconnected Cubes

Disconnected Cubes

In this work by Gaetano Kanizsa, we can see how the absence of contours in the figure facilitates the vision of a cube. The first image seems to be formed by pieces with no apparent connection while the second image, to which some of its edges have been removed, appears a cube.

Solution

Our mind automatically interprets the missing pieces to join them and make sense of the shape.