"But what would really be interesting would be a negative-one pip piece" Man, it would be, like, smaller than a pea! A 0-pointer Base is: 9/16" - 0.21875" = 0.5625" - 0.21875" = 0.34375" (22/64"!) ...and Height = 1.75 * 0.34375 = 0.6015625" (6/10"!) Subtract another 0.21875" from that, and a neg1-pointer Base is: 0.34375 - 0.21875 = 0.125" (1/8") ...and Height = 0.215" (3.44/16") While it might make for interesting Zendo--which is a Serious Bonus®, in my mind, for sure--I just don't think folks could use pieces shorter than 1/4" with an 1/8" base! :) David