3d
You can make a "3D" picture of anything you can draw in Photoshop, but past an image of a 3d scence, no. To an extent, as the old saying goes, "you can't get there from here."
Photoshop is not a 3D app, it is a 2D photo editor program. You can manipulate 3 parallelogram shapes to simulate the appearance of a cube, but you cannot rotate it to see the back three sides.
As for the illusion, it's a matter of being able to draw a cube, and being able to take 3 squares and the Transform>Skew tool to adapt them to the side of cube you are trying to create.
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