First of all I finally caved and redid a couple of earlier blocks that I wasn't completely happy with.
These are Block 2. I inadvertently turned the hour glass units in the block on the left. I thought I'd leave it and be different. But the more I looked at it the more I didn't like it. So I took it apart and repieced it correctly and like it much better.
And I didn't think I had enough contrast in the block on the left below (Block 13)
So I redid that too.
Then I made Block 14
And Block 15