Tetrahedron 2 is made up of 4 equilateral triangles, bound in calf with blind-tooled titles. There are three single section chapters sewn into the three joints. The triangular pages are graded in size and contain coloured diagrams and text relating to the properties of tetrahedra. A stirling silver 'topknot', lined with calf and attached with a chain, forms a clasp.

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