This is a really, really cool looking quilt. I have never attempted a 3D quilt but am inspired to start small with one like this. You're being very patient with all the changes, comments, and suggestions. Each rendition is getting better and better. Do I dare offer one more perspective? If you have already sewn your borders on, don't yell at me. LOL.
But...when I looked at the very first picture, I got the definite feeling of blocks tumbling through space . In the second, however, it reminded me of blocks (or dice or cubes) falling onto a game board with black edges. Both have the tumbling effect, for sure, but when the edges were partly in white space, the feeling was more free-fall. (I actually felt my stomach flip. Haha.)
So...here is my daring-please-don't-scream suggestion: What if , instead of keeping an all-black border, you alternated black with white in the same way you built the rest? In other words, "borderless"?