I like this. Looks like a sculpture pretending to have a purpose beyond its aesthetics :) Very "universal" feel to it against the sky there, good composition.
-k2
Ah yes, I guess the plane trail cleverly makes in qualify. One of the triangles lower left come pretty darn close to touching too. Nice work Bruce.
~Brent
Rod
At first I was going to say you have to have a triangle interact with an edge but then I saw the plane trail in the sky which forms a triangle a. Very sneaky:-) And well done.