I decided to continue my little experiment and see if I could enhance the optical illusion with quilting.
The quilting is far from perfect. But I think I like it.
I grabbed a bit of an old yellow calico for the backing.
The next photo shows the quilting texture, which is both good and bad on a bit like this, every bobble and imperfection shows.
Amazing how difficult it is to get photos of this!
Have a great day!