I think this one would make a cool outdoor sculpture on the order of 25' high or so. The upper corners may pose a problem as they wouldn't have any support other than the single connection to the middle "kyoob". Maybe it could be tapered so that the upper section would be smaller than the lower to reduce the loads (in this image the pipes are of a consistent cross-section). I can just imagine the whole structure swaying on a breezy day. Maybe it would even start to walk around a bit in a strong wind if it started resonating.