Ispired by the Op Art Studio (https://scratch.mit.edu/studios/5371627/) I decided to give it a go myself. Choose a height map and a pattern and click on the green flag. Height Map 2 is best readable with Pattern 3. Height Map 1 and 2 are bitmaps stored in a list, map 3 and the patterns are sort of equations.
Depth Map of Coin from http://www.gigamacro.com/blog/gigapixel-depthmaps-3d-data-export-case-study/
