Again, original art for The Wizard of Op (1975). Ed created these eye-watering pieces of Op art using Rubylith film. Rubylith was red film attached to a clear backing film. You cut out shapes on it using a scalpel and peeled away the pieces you didn’t want. It was usually used for colour overlays but Ed used it in order to achieve razor-sharp lines, rather than draw the piece with a radiograph pen which wasn’t giving him exactly the control he wanted. In the book the image was printed black.