I made a diptych for a line drawing project with HB, 2B, and 4B pencils. I used ten drawings of a bulb from a different perspective. I found out that it looks rotating if I list them all in one line. I started to draw a small image from the left top corner and draw a bigger size for the next image. I continued it until I reach the middle section, which is the biggest image of the bulb, and then I started to draw a smaller image to the right bottom corner. It was pretty hard to draw them balanced in proportion, but it was successfully done by ultimate my skills. ;D