The green flag and see. You can change the slider "a" a=-7 or a=7 deltoid curve in colors http://scratch.mit.edu/projects/2814274 deltoid curve in colors2 http://scratch.mit.edu/projects/19902513
Shared from Scratch 2 Offline Editor Deltoid curve parametric equations described: x = a * (2*cost+cos2t) y = a * (2*sint-sin2t) + geometric transformations music: Papa-paparapa-Papa Remix (Solo Players) (Youtube)