The cool new Kakuzai Wood Memo Block is realistically designed to look just like an actual block of wood. This unique stack of 1200 sheets of memo paper was created by designer Kenjiro Sano as a comment on the relationship between wood and paper. It not only looks like a solid block of wood on the outside, but all the notes on the inside are printed with a detailed woodgrain design as well. Don't bother counting the rings though, because I don't think you can determine the true age of post-it notes this way.
Kakuzai Wood Memo Block