Yesterday I sent out an email with the following content:
Day 2: Disk-ambiguation
The first person to respond to this email will receive this drawing for $2, plus cost of shipping/packaging. (Note: for those who live in the United States, the price of shipping/packaging will likely be around $15.)
This piece was created with a mechanical pencil, a Staedtler pigment liner and prismacolor markers on a sheet of 9 in. x 12 in. 400 Series Strathmore Bristol smooth surface acid-free paper.
The picture above is a cropped scan and the picture below is taken with a phone camera.