Frank Lloyd Wright Oak Park 4 Pack Assorted Image Coaster Set. Frank Lloyd Wright was one of the most renowned architects of the 20th century. Wright's architecture often emphasized horizontal lines, open interior spaces, and a connection to the natural environment. These coasters are printed with two of his Oak Park designs. Each coaster is printed on stone and features a cork backing to protect surfaces from scratches and stains. Coaster measures 4.25" square.