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Pure data: the ground colour, a suggested ink colour, whether the ground is dark (so text should flip light), and the ruling/grid/dot layout.
paper_spec(kind)
A named list describing the paper, or NULL for "none".
NULL
"none"
A value from sketch_papers().
sketch_papers()
Other sketch-paper: element_sketch_paper(), paper_grain(), paper_primitives(), sketch_papers()
element_sketch_paper()
paper_grain()
paper_primitives()