Which artistic clique were said to have "lived in squares, painted in circles and loved in triangles"?

Lucky Irish Fight Club, "loved in triangles" doesn't strictly mean three at a time, just that they weren't monogamous.

Does loving in a triangle involve three people?

Lucky Irish Fight Club, that's what she meant, yes

Look up "dreadnought hoax". Performed in a day when people were more gullible

Highly interesting group of intellectuals. I love artistic people.