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Check out this Flickr image of a long exposure LED K'Nex rollercoaster.
http://www.flickr.com/photos/rbrideau/2143257534/

from the author:
Well I got a K-NEX roller coaster for Christmas, and for fun I disassembled one of the cars and mounted an LED light on it. I then set my camera to do a 15 second exposure and TA-DA!

Trainman, this is perfect for your stuff!

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This is amazing! And yes, this is perfect for Trainman, he could add LEDs to the balls and stuff. Here's the picture if some people don't want to click the link.

that would be amazing - imagine that huge super complex tower that he posted a pic of in his instructable with like ten led balls zooming down it! insanity!

Yeah, that would be insanely insane to the most insaneness of all insane insanity.

lol. but i think it would actually be insane to the fifth. (this was based off of very hasty and not so precise calculations)

Oh, but there's also insaneness of insanity to the maximum insanity or all insaneness of the insane people of insanity to the most insane power of the insanity, but multiply all that, then multiply once again, but multibly it by insane4.

damn. you win. i just don't have enough time to write more than that before class starts. congratulations! =()

Of course I win, because I'm super cool to the coolest of coolly coolness of cool people to the cool of the cool, but cooler then that, then multiply by insanity coolness10.

yeah, thats pretty much true. one thing though - I play bass, and you play guitar, which puts my awesome level starting off at cool to the fifteen octillienth + 6.

I have no idea what octillienth is, but, if you add eggs to more eggs, then divide by the square root of 15,129 (which is 123), then you can multiply that with the answer you get when you solve 13n+4 > 14n-3, then you use point slope form to solve (4,3) (5,3) with the slope being 1 1/2, and you will get your answer, but then put that in slope intercept form, and replace the variables (x) with 2, then divide that by chicken pot pie, and then you get your answer. What's the answer, huh suggie boy?

sorry, i said the word slightly wrong - ocÂ·tilÂ·lion (k-tlyn) n. 1. The cardinal number equal to 1027. 2. Chiefly British The cardinal number equal to 1048 and the answer to your question, is of course, the same answer to the question posed in The Hitchhiker's Guide to the Galaxy Series - 42!

i already put LEDs in to a knex thing. click on my name and go to the forum topic named LED lit knex target.

Sweet. As soon as I'm done with my current projects, I'll build some ball machines and whatnot, really show what I can do.