An emulsion shock is  a shock that allows the air and oil to mix; it does not utilize an internal rubber bladder. Silicone oil doesnât compress well without the help of some air to displace the space taken up by the piston when itâs moving within the shock body.
The Joy of Mechanical Force. (The Foundation of Futurism [Manifesto of Futurism, 1909], translated from the French by Eugen Weber, reprinted by permission of Dodd, Mead and Company from Paths to the Present by Eugen Weber. Copyright 1960 by Dodd, Mead and Company, Inc.)
I wish we could be sure that the same is the case with Jencks and July 15, 1972; unfortunately, he might not be kidding. Jencks seems to think that one can speak with a great deal of precision about postmodernism - not only about when it began, but about what it is, and who belongs to it.