You get four tiles, Two from the arizona biltmore and two frank lloyd wright signed. If you incorporate these into a fireplace, you would be best to use the 1/4 inch or 5/16  inch grout joint because that is the most eye appealing and most symmetrical...

You can see that the tiles that are signed by Frank Lloyd Wright have a little bit darker patches in them and that is the beauty of the drying of the clay. The beauty is always in the  asymmetrics, just look at the human face...

These are terracotta and one of them on the back is stamped.Arizona biltmore while the other one is signed.Frank lloyd wright. I have seen these accent fireplaces but you could probably use them anywhere or use them as a trivit. Now i'm gonna let a I take a stab at it. Take it away ender of worlds...

This is a vintage Frankoma square tile made of terracotta clay. The tile features a design by Frank Lloyd Wright and was produced using the pottery technique. It measures 6x6 inches and has no glaze finish. The tile was likely used in the Arizona Biltmore Hotel and can be used to decorate various rooms such as the office, conservatory, bathroom, kitchen, living room, patio, and hallway. It was made in the United States as part of the art pottery production style.