Optical Delight! Construction, Color and Moire, Albert Gregory, 1965 First Edition, (#28 of 200)I believe this book, and the Color Aid pack, and the Grumbacher pastels listed today all came from the estate of the same artist I found them all in the same consignment shop and together they create something of a portrait or at least I've i made them into one! I also think that the artist was someone whose name we might recognize; seems one would have been rather in the know and in the loop to have a copy of this one. It is a very cool artist book