Rapid plant movement slower "growth-movements" of plants, called tropisms. Tropisms encompass movements that lead to physical, permanent alterations of the plant while rapid plant movements are usually reversible or occur at over a shorter span of time. A variety of mechanisms are utilized by plants in order to achieve these fast movements. Extremely fast movements such as the explosive spore dispersal techniques of "Sphagnum" mosses may involve increasing internal pressure via dehydration, causing a sudden propulsion of spores up or through the rapid opening of the "flower" opening triggered by insect pollination. Fast movement can also be expressed in predatory plants, where the
This Is What You Want... This Is What You Get were not re-recorded for "This Is What You Want...This Is What You Get" (although a remixed version of "Blue Water" was included as the B-side on the "This Is Not a Love Song" 12" single). Songs on "This Is What You Want...This Is What You Get" which did not appear in any form on "Commercial Zone" are "Tie Me to the Length of That", "The Pardon" and "1981", and are the only songs on the album which do not credit Keith Levene as a co-writer. PiL was supposed to score the soundtrack for the 1983 suspense film "Copkiller", starring Harvey