This is a nice idea for this challenge. I think it fits the challenge of triangles well.
The lighting does not work in my opinion though. I think that the round shadows in the lower right distract from the triangle shapes we are suposed to be concentrating on. The lighting is just way too harsh/dark to work effectively here.
I do however, like the triangle shape shadows in the upper right and lower left corners of the shot. I think that works. If you could somehow keep those shadows while eliminating the others, I think that could be cool.
Colors are good, just maybe a bit dark.
Focus seems ok on the seams, but the edges of the balls seem a bit soft to me. This might be a lighting thing too.
Overall, I like the idea and the set up is nice, but suffers greatly from lighting.
~Heather~
IMO triangles too close to edge and shadow is distracting. try placing light more on top of these and try not to crop so close. just my opinion. hope i helped :o)