Its quite heavy and the glass is thick where it would be" load bearing" and the top concave bit isn't really deep enough to hold a wet sponge, but I can see what you mean. It was sold to me as a paperweight, but I wasn't going to argue

I did spot a matching green

pair recently on eBay I think described as piano rests/insulators, but unattributed.
It is a gorgeous lump, very jelly like and edible looking
