Some might remember this excellent treatment of higher dimensions [1] in which you first manipulate shapes to solve a puzzle in 2D, then 3D, and finally 4D. YY

Some might remember this excellent treatment of higher dimensions [1] in which you first manipulate shapes to solve a puzzle in 2D, then 3D, and finally 4D. YYou develop a keen sense of 4D objects: [1] http://harmen.vanderwal.eu/hypercube/ http://harmen.vanderwal.eu/hypercube/