In the image above, if we focus from one angle, the 3D cylinder’s shadow looks like a 2D square—but if you look from the other angle, the cylinder’s shadow looks like a 2D circle.

Tom Hanks starred in an adaptation of Dave Eggers’s book “A Hologram for the King” last year, and now he stars again in a film version of an Eggers novel called “The Circle,” an over-the ...