Conceived by conceptual artist Harriet Bart, 13 ÷ 14 is a visual interpretation of the poem "Thirteen Ways of Looking At A Blackbird" by Wallace Stevens, and fits squarely into the formalist tradition of Conceptual Art. Bart used the mathematical puzzle known as the Loculus of Archimedes as the starting point for her illustrations. A dissection puzzle game, the Loculus consists of a square divided into 14 polygons in accordance with certain specific geometric constraints. Bart rearranged these 14 polygons in different layouts to create an illustration for each of the stanzas in the riddle-like poem.

A copy of this work is currently on display at the Maier Art Museum at Randolph University in Lynchburg, Virginia.