Just click on the green flag.
This project is a simple example of how to use the 'effects' in the Looks menu. I had never played with the effects and was motivated to take a look at Looks by the Variable effects- cells! project uploaded by dapontes . The code will show you how esy it was to get 'beating heart' effect using fisheye. I just had to fiddle with the parameters to get to beat like I wanted it to. The 'heart rate slider' lets you vary the beat. I’m working on several math projects at the moment so I won’t get back to this project anytime soon. This would be a great animated science project so get to remxing!