transform-style: preserve-3d
front
back
right
left
top
bottom
a cube: six faces, depth-tested
1
2
3
4
5
6
a carousel: six panels around an axis, backs hidden
front
back
flip card, rotateY(0deg)
front
back
rotateY(70deg): turning
front
back
rotateY(180deg): the back, not the front
three planes that intersect, preserve-3d
the same planes, transform-style: flat