That image has been created using as a basis a photo from the sea surface and the flow of the wave movement. Processed based on color and increased contrast in order to use the water flow as a basic pattern
This 3.5" x 3.5" square rubber coaster is made of a durable heat-resistant polyester fabric top, backed with a neoprene rubber non-slip backing, keeps things from sliding. The rubber coaster is 1/8" thick. It will not discolor or fade, machine washable.