Prints may be classed as (1) relief-prints, (2) intaglio-prints, (3) surface-prints, according to whether the black line of the design (i.e. the part inked for printing) on the original block, plate or stone is (i) in relief, (ii) in intaglio (i.e. cut into the surface), (iii) on the surface (i.e. on a level with the rest of the surface).