Best Industrial Stone. Nature inspires. Design creates and recreates. Graphic work overlays different natural stones making an industrial material arise from embossed slate, marble veins and layers of granite on a single surface. Several stones in the same stone, this is the concept. This surface is for outdoor and indoor applications, B.I.S. surprisingly, in 60x60 and 90x90 formats, and also in cross sections to emphasize the overlaid design.