A noun is either an atom (an unsigned arbitrary-precision integer, a natural number) or a cell (a pair of nouns). Nouns are acyclic binary trees in which all leafs are atoms. Nouns are written with [] brackets, but rightward-branching cells may elide brackets (i.e., [4 [0 1]] == [4 0 1] but not [[4 0] 1]).
Mondrian is a package for drawing nouns as compact graphical representations.
Usage:
python3 mondrian.py "[4 0 1]"
mondrian.svg: 28x28px canvas, 3 leaves, depth 2, mode=compact, min-leaf=14.0
python3 mondrian.py "[8 [1 0] 8 [1 6 [5 [1 43] 4 0 6] [0 6] 9 2 10 [6 4 0 6] 0 1] 9 2 0 1]"
mondrian.svg: 154x126px canvas, 27 leaves, depth 15, mode=compact, min-leaf=14.0