Who knows, that bit, that leftover, may come in handy again. A good feature not to throw something away too quickly. I have often managed to solve something because I had ‘kept something somewhere’. The downside is that it can sometimes get out of hand and the amount of leftovers is more or less reluctant. For example, I saved some undamaged parts of a chair that I literally slumped through. Composing a new frame, a leftovers-frame, from preserved frame pieces requires a drawing in which the depicted chair is also composed of parts of (four) other chairs.