Serenity Dome, a Callisto-style 2/5 oblate ellipse. It has a diameter of 50 ft, 28,700+ cubic feet, 2675 ft2 of floor area, and 103 yds3 of concrete in the shell and floor for thermal battery. According to Chris, "Serenity Dome uses about 1/3 the energy of our previous brick-and-stick built home in Virginia Beach. It’s tough to find an investment like a Monolithic Dome! (Chris Ecker)