ANGULAR TREEMAPS - Information Visualisation: Techniques, Usability and Evaluation - page 94

Fig. 5.6. Pentagonal container illustration: a large data set which has
approximately 16,000 nodes (>10 levels) with a partition angle of 90 degrees.
a b
Fig. 5.7. Hexagonal container illustration: a large data set which has over 81,000
nodes on a convex polygon, with partition angles of a) 45 degrees and b) 15
degrees