This sculpture from Instructables is composed of seventy-two pencils, a load of super glue, and a couple of rubber bands. It was inspired by the geometric sculptures of George W. Hart and designed by geometry whiz Alejandro Erickson in an attempt to re-create Hart’s 72 Pencils.
…It took a couple of leisurely hours to build and glue, and with supervision was surprisingly easy to make. It can be assembled inexpensively using wooden pencils ($5.74 for 72), a few rubber bands and a little superglue, in pretty much exactly the same way as Alejandro makes his Hexastix sculptures… The hexagonal cross-section of the pencils make them a very natural fit for this geometric form, as the holes in the lattice are themselves hexagonal. The erasers are arranged tetrahedrally with respect to one another; the volume enclosed by the pencils is a rhombic dodecahedron.