Date: 17 July 1980 14:38 edt From: Greenberg.Multics at MIT-Multics Subject: Re: the cross design To: RP at MIT-MC (Richard Pavelle) cc: CUBE-LOVERS at MIT-MC In-Reply-To: Message of 17 July 1980 14:20 edt from Richard Pavelle There are two such sets of patterns known, one with three sets of paired colors (the Christman cross) and one with two triplets of colors (the Plumer cross). The Plummer cross is achieved by two orthogonal applications of the transform to the Christman cross. The transforms are fairly long and hairy, and I hesitate a little before attempting to describe them, but will if people want.