Abstract: For the most part, there has been very little innovation in the design of water or other slides. An interesting development in this area involves a slide apparatus including a trough with an upper slide surface of generally parabolic, upwardly opening cross section throughout its length, the slide being tilted from the rear inlet end thereof to the front outlet or discharge end thereof. Riders on the slide move along a path of travel resembling that of an underdamped oscillator, and for the first time riders are able to experience the sensation of sliding forwardly and backwardly within a waterslide configuration, in complete safety, throughout the duration of the ride.