Combinatorial possibilities of missing lines in a cube (at a given rotation).
P-161, series of 13 plotter drawings / ink on paper, 1975, 40cm x 40cm each
Only 11 of the 13 drawings are shown on this webpage - above
The 2 drawings associated with zero lines not shown here:
drawing 1) cube with zero lines (empty set)
drawing 2) one cube with 12 lines. The series of all 13 drawings are published in the 1975 catalog - see below.