If I understand this correctly, this work by Rachel Wolfson is made by generating a bunch of texture maps in a 3D program. She splits them up, and uses them to make gouache paintings. The final work is made by assembling these painted versions back together.
My buddy Rone just knocked out what is being dubbed the largest mural by one person in Australia. This 9-storey monster took the artist a solid week, working 10 hours each day. More images and a news clip below.