Patent ID: 6881463

Claim:
A surface covering unit comprised of x primary elements, wherein x is an integer equal to or greater than 2, each primary element being a rotational tessellation having a first side extending in a generally radial direction relative to a first vertex, said first side being irregularly shaped; a second side extending in a generally radial direction relative to the first vertex and being rotationally spaced from said first side by a first angle of 60, 90, 120 or 180 degrees, said second side being substantially a rotational image of said first side; a third side extending in a generally radial direction relative to a second vertex, the second vertex being spaced from the first vertex, and a fourth side extending in a generally radial direction relative to the second vertex and being substantially a rotational image of said third side and rotationally spaced therefrom by a second angle, wherein the sum of the first and second angles is 180, 240, 270 or 300 degrees.