This is a series of three drawings. Each drawing consists of four circular figures. Two of the figures the lines all converge in the center. They are drawn with Faber Castell Pitt Artist pens in Phthalo Blue and Indanthrene Blue, love those names. The other two figures with open centers were drawn in three varying shades of blue pencil color. These are on Fabriano Artistico 100% cotton paper.
Variable 3 is on my art shop, Variable 1 & 2 have sold.