This is actually the first silk piece of this design, it preceded the rainbow version by some months. Here's a fun fact to know and tell: a word or words that are the same upside-down and right-side-up are called ambigrams. Not to be confused with palindrones, something of which my father is an expert. His creation for my second son: Sail, Elias!
My father adds the following:
Two points please,
1. Ambigrams were celebrated in 1961, of course. 2. The first son's palindrome is more elaborate providing you accept CA for California: Did Isaac nix a tax in CA as I did?