Product after Sol LeWitt
Inspired by the drawing
Successive Rows of Horizontal, Straight Lines from Top to Bottom, and Vertical, Straight Lines from Left to Right, 1972 by Sol LeWitt,
first seen by me at vjeranski's art tumblr, http://vjeranski.tumblr.com/post/112892688148/sol-lewitt-successive-rows-of-horizontal-straight
Lovely sketch, with a construction that has similar sights in math. Tim Cieplowski pointed out this colorful proportional multiplication table.
http://thegriddle.net/handouts/mult_color_num.pdf
In this sketch you can set the factors and have them show or not show.