Oddly balanced rockwork, elevated above the sand to provide more total surface area. Fish in every area, like gobies/blennies in caves, psuedos in a school, and tangs racing in and out of open rockwork. It is hard to keep rock off the sand in large portions and then stacking rock on top of that to take full advantage of the height in a tank. I always felt that Felipe had an amazing knack for aquascaping.