Red planar trajectory traced by a red point on grey table can be transferred to other place thanks to a system of two parallelogram mechanisms. The blue table planarly translates. Each point on it reproduces the red trajectory (violet curve) thus the multiplying is possible.
A stationary point traces on the blue table a curve that is the red trajectory flipped two times around longitudinal and traversal axes of the mechanism (or turned 180 deg. in its plane).