in the joints. The clarity and openness of the glass is encased in the absolute opacity of stone. Their displaced but highly controlled fault-lines grind against each other at the edge of chaos, like tectonic plates. Carlson's more recent works, wall-hung groupings of square tiles of clear glass cast with the textures of things like corrugated cardboard and bubble wrap, are a radical departure from his familiar hardedged constructivism. The tiles are first sandblasted and stained with oxides, then partially polished back so that you can make out fragments of Latin imprinted on the backsides, utterances of a vanished tongue.