In the website's Free Store you can read the short story Moon Whistling by on a Cloud.
This rendition of the Moon Cloud theme is called the Grateful Dead Stone Moon Cloud.
The stone is called Owayhee Sand stone. The size is under a square foot, and its weight is less than two pounnds.
And of course, it is signed on the bottom.
This sand stone is fragile, so be careful with it.
Remember: No Reasonable Price refused.
Cheers, Brian Wizard