In Leo Steinberg’s essay ‘(b.1920) from Other Criteria’ he discusses modest art from the 19th century to the present “contesting Greenberg’s account over a broad front, and relating Modernist work to changing continuum of self-reference and representation of the world going back to the Renaissance”.
Leo Steinberg then goes on to talk about how we change art to suit the human posture as ‘The top of the picture corresponds to where we hold our heads aloft; while its lower edge gravitates to where we place our feet”.
He then goes on to explain how this applies to Jackson Pollock ’s drip paintings where the pigment is poured and dripped on canvases that are laid on the ground and then they are tacked to the wall after the first colour skeins. “He lived with the painting in its uprighted state, as with the world confronting the human posture”. And this leads Steinberg to believe that the Abstract Expressionists were still nature painters.
Whereas Robert Rauschenberg’s works are still hung up and displayed this way today, and Steinberg goes on to say that “They no more depend on a head-to-toe correspondence with human posture than a newspaper does”.
Leo Steinberg describes the shift in approaches by artists as new mechanical printing methods arouse such as the Flat bed press, by stating “the painted surface is no longer the analogue of a visual experience of nature but of operational process”. So this leads me to believe that Steinberg doesn’t like the thought of art being mass produced and easy to recreate, I think he liked that art used to be only one of each piece and if something was tried to be recreated it would be hard to make something look completely similar to the original. Whereas it would’ve been a lot easier to make more prints and recreate pieces using a flat bed press.

Richard Serra’s essay ‘(b. 1939) from The Yale Lecture’ explains how his work is site specific because of the “scale, size and location”, if the art was moved away from its intended viewing point this would take some of the context and meaning away from it. So the art work must stay in the space it was initially created to be viewed in for it to have the full effect on the audience.
This is different to what Steinberg was saying about the works being made and then being fit in around the human posture, I believe that they are both right in what they are saying. But when making a piece of art you firstly have to think about where it will be viewed and if this should play a part in the meaning of the work or not.

Sources:
Art In Theory 1900-1990
An Anthology of Changing Ideas
Edited by Charles Harrison & Paul Wood

1. Leo Steinberg, “From Other Criteria”, Pg. 948
2. Richard Serra, From the Yale Lecture, Pg. 1124