I almost took the same typed of picture. I think this would have been better shot through the middle of the triangles. All the other things in the picture are distracting and the yellow poles all seem be leaning over.
I like the repeating elements going away from my eye ... into infinity (well suggested). I also like the bold colors here. My only problem is the lighting, too harsh. You probably get better lighting if you waited to take this in late afternoon.
image is crooked. I feel this would have looked better if the top of the front triangle had not been cut of. I also feel that if this had been shot from a bit higher up looking through the triangle this would have alowed you to crop out all of the destracting extras such as the pink pole. I feel you were on to a good start but that you rushed this one before you found somthing that you were truely happy with. It apears to be the begining of an intetresting shot .. yet it also looks unfinished.
Suject is tilted - can't tell if it's intentional or not, but I don't particularly like it. You've also got some rough edges where the red contrasts against the blue (I know there's a term for it, but I can't think of it). I like the colors and perspective, though, and I think that with a couple of tweaks this could be a really good photo.
mmh... the triangles are slightly crooked, you could have cropped them straighter. Also watch for image noise. Try to make foreground items blend into the composition -- i.e. leave them out or don't crop them into pieces (like the pink tubing on the right)
This shot is a little too busy :( but nice idea for the triangle challenge. I like the receding triangles except for future challenges you might want to set apart your subject a bit more. It's also a little blurry. Good luck on this challenge and for future challenges too. Farewell-