A point-of-sale demonstration system includes a display system for viewing the underside of the plunger matrix mattress allowing a person sitting or lying on the mattress to readily view the impression created by their body weight on the plungers. The display system includes a camera positioned to image the underside of the mattress and a monitor (display screen) positioned for viewing by a person lying on the mattress so that they can see the deflection in the bottom of the plungers caused by their own weight on the mattress. Seeing the image of the downwardly displaced plungers immediately conveys the operation of the plunger matrix mattress to the viewer. The system may also be configured to capture individual frames and video images, store the images, transmit the images, and edit as desired, for example by zooming, cropping, changing the speed of the video, and so forth.