Algodoo

You may expect a cool dynamic amazing you've never seen anything like it creation. But sadly no, this is a clunky unsmooth messy, unreliable but working contraption, I've never seen this on the algobox so I believe(this is so simple that someone probably has though) I am the first to invent it. You know, the firsts are always bad, like the first computers were huge and had low cpu power.

How it works:
there's a cutter laser sitting there in the barrel, when the light reflects off it cuts the sensing film, when it gets cut the piston can move and pushes it into a killer block killing it, when it gets below the level of the rest of the sensing film, the sensing film gets pushed above the piston and the cycle restarts.

I will make something more complicated than a laser triggered piston.