Drag to turn, scroll or pinch to zoom; draw Explode to take it apart. Every part is the cut files’ own outline: each pipe a tube of finger-jointed strips, glued to its neighbours, with its plug, darker, at its blue line. The buttons switch between the octagonal row, the octagons in two rows, the hexagonal zigzag and the hexagonal row, each with the chamfer edge’s line along the back of the rim where the back is free.