L.2013.6.4 i: Concrete Mixer, plate 9 from Revolving Doors

IX. Concrete mixer: Grating beyond any need, three funnels will receive only a liquid and will determine the color by their relative positions. All existing residue distributes itself impartially on the three and touches spherical proportions. The wooden planks criss-cross as long as there is some work to do, and supply an appropriate sourdine to an operation otherwise too discordant.
Man Ray
New York, 1916–17