  The motivation for using qualitative shape descriptions is as follows:
qualitative shape descriptions can implicitly act as a schema for measuring the
similarity of shapes, which has the potential to be cognitively adequate. Then,
shapes which are similar to each other would also be similar for a pattern
recognition algorithm. There is substantial work in pattern recognition and
computer vision dealing with shape similarity. Here with our approach to
qualitative shape descriptions and shape similarity, the focus is on achieving
a representation using only simple predicates that a human could even apply
without computer support.
