ABSTRACT
Labelled skeletons may be used to separate points that have additional information available, but more often this is not the case. In particular, for strings of points, where the distance between consecutive points is clearly less than the distance separating strings, it is often desirable to ‘connect the dots’ (to form the ‘crust’) – and also to define skeletons, as before, composed of portions of Voronoi cell boundaries, that separate the strings. To achieve this we need to go back to before the availability of digital computers, when (Blum 1967) was attempting to describe ‘biological shapes’ – the following five sketches were derived from his work.
