PDT stands for Pierre De Taille, which is French for Ashlar, stone worked into a square block for building with. It refers to a traditional way of making architecture following a what-you-see-is-what-you-get process. Blocks of stone left over from an imaginary building site appear to have been worn down to new shapes on a domestic scale: melancholic traces of an architectural past. These limestone remnants are carved out by a digitally controlled milling machine.