A bit of Forsythe has never hurt anyone, has it?
This video is from Forsythe's CD-Rom Improvisation Technologies: A Tool for the Analytical Dance Eye. The CD-Rom contains 60 video chapters in which Forsythe explains his movement language.
I love how things appear to help see what Forsythe wanted. The videos were made in 1994 - imagine what we could do now that film technology has progressed so much.
Out of print at Amazon. You can view them all here.