Sixteen Miles of String by Marcel Duchamp, New York City, 1942.
For an exhibit by Andre Breton titled First Papers of Surrealism. The whole purpose of this exhibit was to block the gallery paintings from the viewers. Duchamp even invited some children to play ball or jump rope as part of the exhibit and this infuriated many of the attendants. The placement of the string is so perfect, especially how it angles from the top to the bottom. On the very top it looks like weaving and near the bottom you can make out some prism shapes.
Here is an image of Duchamp standing inside the installation:
and here is Josh Smith’s 2007 tribute entitled Genisis, I’m Sorry