Click the green flag, sit back, enjoy. Don't get dizzy! Please check out the nice remixes made by other scratchers: https://scratch.mit.edu/studios/27457559/ And of course, feel free to remix yourself!
Small variation on my own 'quad vortex' remix. The effect is now even more mesmerizing. https://scratch.mit.edu/projects/422691507/ Tip: there are many more interesting patterns. Change the number in the 'turn 89' block and see what happens!