Not simply stands. The up facing surface on the floor contains more woofers/tweeters. Check out the related "Zephrin 46" thread. The design goal, to quote from that thread, "... based on Jim Romeyn's Late Ceiling Splash (LCS) configuration, which is used here with his permission, the idea is to get a lot of spectrally-correct, relatively late-arriving reverberant energy into the room without the room-placement requirements of dipole, bipole, or omni speakers. The extra reverberant energy is fired from the floor up towards the ceiling, which gives us a nice long path-length-induced time delay. This improves timbre, spaciousness, and the sense of envelopment. The long delay preserves the imaging cues from the front-firing array, and then the ambience cues that are on the recording come from more realistic directions instead of primarily from the direction of the speakers (which is probably the worst possible direction). So we get imaging and envelopment. Additional benefits include eliminating the baffle-step and mitigating the floor-bounce notch."
The original name was derived from the cabinet shape and the number of woofers/tweeters.