A photo of the object's end, head-on, lying the way it will sit on the wall. The photo only gives the shape; you type the size below.
The outline shows over the photo: drag, add or delete points until it matches. Or draw over it by clicking the corners: without auto-tracing, the photo doesn't count toward your photo limit. The photo, outline and measurements are saved with the part, visible only to you.
No photo: rectangle. The bar on the left is the board.