Patent ID: 8365491

Claim:
A plurality of sets of parquet blocks that are adapted for being adhered to a supporting surface in a desired pattern with each block including edges that define the perimeter of the block, including a reference edge, a top surface with a plurality of pointed ridges each having a triangular cross section at its local maximum, wherein the pointed ridges are in a generally parallel relationship, there being at least a first set, a second set, and a third set of blocks with the blocks in each of the three sets having the pointed ridges extending at a preselected angle relative to its reference edge that is at a different angle than the angles of extension of the pointed ridges of blocks of each of the other sets, the blocks being adherable to the supporting surface with adjacent blocks having edges in abutting relationship and the blocks from more than two sets being adhered to the supporting surface in a preselected array to provide patterns of shading that vary with the change of at least one of the angle of light impinging on the array and the angle of sight in viewing the array, wherein at least one of the pointed ridges are pointed ridges that extend clear across the blocks and the blocks of each set are of the same parametric dimension as the blocks of the other sets.