Posted: Dec 01, 2018 7:24 pm
Here's a version of the one I was thinking of. The ball is larger, the surface patterns are different, the watermark doesn't help and the effect is not as good. Heigh ho.
Lifeboat for the rational mind :D
http://www.rationalskepticism.org/
http://www.rationalskepticism.org/viewtopic.php?p=2665652#p2665652