is similar to nostrudel? https://next.nostrudel.ninja/#/u/npub1ty3ftnetpxnlj42lgwkmwdxta69gfm5f9mfljvmwdgymvsf6pkuswhxq4p
I'm not sure but it's an interesting way to represent keys.
see also https://github.com/1l0/hexpattern
Discussion
Yes, the concept is similar.
The noStrudel one uses the first 6 digits of a pubkey to determine the color based on RGB, while this one seems to use 8 digits x8 colors based on HSL with alpha.