| 摘要 |
An irregular, tessellated building unit comprises x primary elements, wherei n x is an integer equal to or greater than 1. The primary element (20) is a rotational tessellation having a plural pairs of sides extending in a generally radial direction from plural vertices, respectively. In each pair, the two sides are rotationally spaced by an angle that is divided evenly int o 360 degrees. Preferably, all of the sides are irregularly shaped, but one or more sides could be wholly or partially straight. Optionally, spacers are provided on the sides of each unit. A wide variety of units may be construct ed having different numbers and arrangements of primary elements (20). As all t he units are combinations of primary elements (20), they readily mate with each other. A surface covering (10) comprises a multiplicity of units assembled t o form a continuous surface without overlap between units and without substantial gaps.
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