“You can build up a really nice thick-looking piece without having to use a thick slab,” he says. It’s even possible to engrave the edge of a white marble countertop with a pattern of your ...

The sun shines, and the three slabs of white marble gleam, apparently spotless until Horner leans down, licks her thumb and rubs it against a smudge. “See that?” she says as the spot disappears.