The shape of the taxonomy in K-12 Physics. Top-level names appear as roots; their values are listed beneath them. A value that's also a name somewhere else has its own children rendered nested in place.
Legend: A Analytical · F Filtering · name term has children · leaf term has no children in this branch · tangled term has multiple parents (DAG, not pure tree)
Tangled value-terms: 14 terms appear in more than one place in the tree. This may be intentional or may indicate cleanup work.