Dick Termes is an internationally-acclaimed artist whose work has been recognized around the world. He is a truly unique artist who utilizes a revolutionary 6 point perspective system to paint fanciful worlds on spheres known as Termespheres. Each TermesphereÂ® is a revolving, three-dimensional optical illusion, ranging in size from 1 to 7.5 feet. Located southeast of Spearfish, the Termesphere Gallery is open year-round. During the summer, it is open seven days per week, 9 a.m.-5 p.m.