Originally created in 2015, the picture ball machine was an experiment in using photos along with invisible barriers to create a marble run. I was quite pleased with the result, but disappointed by the response to it on Algobox (The online community for Algodoo), as I think most people did not understand what it was based on the title and picture. In March 2017 I modified the machine so that the marbles won’t clump up as much by installing a feeder wheel underneath the machine.