Andy Warhol and Alberto Giacometti both used ballpoints within their artwork in the 1950s. Lee also creates artwork in a similar vein using ballpoints or acrylic paint on canvas. He uses "ordinary ballpoints that you can buy anywhere for about 80 yen". Mylne used only black ballpoints, but produced a limited-edition print with additional background colour. Modern ballpoints are said to have a two-year shelf life, on average. William Adkins uses ballpoints to draw intricate devices with imagined uses.