Japanese designer Kouichi Okamoto has made a tape cutter with a curved edge that he uses to create drip-like patterns. My whole LIQUID project, presented here in black and white, was entirely inspired by Okamoto’s “Liquid Tape Cutter” works: http://www.dezeen.com/2013/05/20/liquid-tape-cutter-by-kouichi-okamoto-for-kyouei-design/
