/ic/ - Artwork/Critique

>>4395246
>>4395132
it might help to keep in mind the "vanishing lines" (VL) of a cube's planes.

A VL represents where parallel planes appear to converge at infinity, eg the horizon line is a VL of the ground plane and all planes parallel to the ground plane. A cube has 3 sets of parallel planes, so it follows that it has 3 VLs. You can see in the 3rd image here, those colored VLs intersect to give the 3 VPs of the cube. VLs can be helpful to know because VPs "ride" on those VLs as a pair, like they do in >>4393850

In (1), there's only 2 VLs visible (Red and Blue) because the Green VL exists at infinity. The Red and Blue VL intersect at the central VP.
In (2), the cube is rotated clockwise such that it gains a left and right VP that "ride" on the Red VL. Those VPs represent intersections of the Blue VL and now-visible Green VL.
In (3), the cube is tilted towards the viewer such that it gains a vertical VP and its right VP "rides up" the Blue VL, which tilts the Red and Green VL.