(A) Range-finding vs (B) camouflage-breaking 3D. In both A and B, the images depict a triangle in front of a background. In A, the triangle is visible in each eye individually. B shows a random-dot stereogram37. Here, each eye sees featureless noise, with no triangular object visible. But viewed binocularly, a triangle pops out in depth. Readers who can manage to cross their eyes so that each eye views the appropriate image will be able to see this effect for themselves.