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Figure 60 comprises 11 lengths of material arranged such that the end sections are visible. The profiles of the section appear to be the same along their whole length. The sections are too complex to describe here but they do share certain characteristics. They look like they could be made from sheet but closer examination reveals that this would not be possible. The profiles are too complex and intricate. The material thicknesses are not all constant for each profile. Most of the profiles are completely hollow, nearly hollow or have parts that could be described as hollow.

 4.2.3 Classifying shapes