Your absolutely right Gary I did use M.C. Eschers optical illusion. This is the original drawing I did some time ago and I like what you have done in your image, looks great. I had not lost interest in the balls on blocks, just did'nt know where to go with it after altering a couple of textures you suggested but seeing your image with lighting and shade has woke me up and I will go back to it.
Stygg
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