Circular Image
Redundant?
Yes, pretty much all of this is available with the regular image block.
So, why?
For working within a theme, it’s nice to be able to have a set of elements with consistent controls and presentations. The circular image block is to make it easy to add a circular image that is consistent with the image in the circular image gallery.
And, of course, there needs to be a gratuitous amount of images.
The Block
This is one of the blocks that renders the front-end, through render.php, completely independently from the edit panel through edit.js and returns null from save.js