They are 3 0-27 loops. 15" from lower to mid level, then 10" from mid level to table top.(2¾"h black boxes). Shot sitting from 5' away and from about 15" away on the close shot.
Note the increased height of the space down low, but the reveal/non-eclipsed/ seen portion of the rear of each level is about equal.
So sitting or standing ? Because the the higher the eyes and closer you are, the more one level blocks the other. That view angle is important.
I started this with an equal split in mind; but the split wasn't as visually pleasing.
I'm going to fill in only the rear half of level 2 and make a faux curved under-arch from leg to leg (canyon wall type footing...up high on legs) ...to keep the ability to look thru much of level 2 down to level 3 below.