We just finished our rube Goldberg now all we have to do is edit our videos. Our rube Goldberg is very cool in it first we roll a ball down a tube, it hits dominoes then hits a box. The box is on a table end then it falls down onto the floor, the box hits a domino and causes all the others to fall. Then one domino hits a mini catapult which rolls a ball off into a track, then the ball hits dominoes again and the dominoes fall which hits some stacked dominoes and those cause a domino to fall with a string attached to it and a pulley and the cage. Applying enough force the string pulls on the cage door and opens it. I think this rube Goldberg is very good.