I had one set of these Rayo Card Co, Pyramid Solitaire cards a number of years ago and have thought of them many times since, so was delighted when someone reached out to me having inherited a deck and asked if I was interested. I think the design of them is so good, and so contemporary feeling, that I almost can't believe they exist--and date (I know from the other deck I had) to 1907! But indeed they do--and while the instructions are missing from this set, I had photographed from them last deck I had, with those photos of the instructions included here. 

The game is akin traditional solitaire, but with a different set up and configuration--and much more satisfying I think for the super graphic rainbow of colors and geometrical progression of the stacking order: i.e, orange cover goes on top of orange ribbon on top of orange spot on top of orange square on top of orange left angle on top of orange right angle... (I wasn't paying quite enough attention when arranging this deck to photograph and have a few sequences slightly out of order-- but it is easy to figure out once you get the logic.)

These are SUPER rare; I have looked and looked and not found a single reference to them, only a couple of archival citations of the Rayo Card Co, one in 1907 and one in 1912. This I believe is a complete deck, 56 cards, in their original box with interior sleeve

Box 3 3/4" x 2 3/4" x 7/8". 56 cards. All in very good condition, cards crisp and clean, with just some general wear to the box and loss of one side of the exterior box, which is otherwise holding together just fine.