A 2D display can depict something in 3D if the 3D object is at most 3 discrete layers thick. Easiest is some voxel object 3 layers thick. The three layers are assigned colors: red green blue. The presence or absence of a voxel on in a color layer causes different colors to occur.
Similarly, 3D is enough to depict something in 4D at most 3 layers thick in the 4th dimension.
Possibly useful for the point growth fractal. Just a little bit of 3D might be enough for points to slide past each other.
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