I meant to show this last month. This is just part of the entire image, which is part of a book cover. I used a stock image for the wooden surface of the desk. I used a high resolution scan of a page from one of daVinci’s notebooks… (I bought a license of course) But the part I am most pleased with is the prism, which I built from scratch. I used many layers and morphed snips from the wood image to make it look like the light is bending inside the glass of the prism.