Visualizing three-dimensional objects presented on the flat surface ... intended may be next to impossible. Consider the two figures shown below.

In Experiment 1, PET measures were taken while subjects engaged in either a spatial-memory task (retain the position of three dots for 3 sec) or an object-memory task (retain the identity of two ...

Mobius strip ring sacred geometry. Spatial figure with upturned surfaces. Optical illusion with dual circular contour 3d render. Animation video available in 4k FullHD and HD render footage.