Patent ID: 7797890

Claim:
A system for covering a surface, comprising: a tile having a body; a plurality of identical interlocking structure extending from a side of the body, wherein each interlocking structure comprises a mushroom cap and a stem, wherein the mushroom cap includes a top portion extending from one side of the mushroom cap to another and a first curve connected to a second curve on each side of the top portion, the first curve having a R 1 radius and the second curve having an R 2 radius, R 1 being greater than R 2 , and wherein the mushroom cap and the stem are symmetrical along an axis of the interlocking structure relative to the side; a first area forms between each stem in a first shape that corresponds to the mushroom cap; a second area forms between each mushroom cap in a second shape that corresponds to the stem; and a first and second comer displaced on opposite ends of the side, wherein the first comer has a comer cap and a comer stem and, wherein the second comer has a third and a fourth area to receive a third and a fourth shape that corresponds to the comer cap and the comer stem respectively.