Don’t you like the name of this block? I think it provides ‘scope for imagination’ and evokes mystery. That is one of the things I like about vintage blocks. They, often, have great names.
I thought that background fabric in the middle might look like the viewer was looking through the block to the background, but I don’t think I achieved that semi-goal.
If you want to make a block like this, review the Star Sampler: Wheel of Time pattern, which can also be found in EQ. Also, take a look at the original Quilt-a-long instructions. You can see all the posts on this topic by searching the tag “Star Sampler.”