In this project, i add rotation effect to the spiral of Theodorus.
I like it. I used the volume of my voice to control the spin speed. 
cool idea !
Nice. I don't know about being hypnotized, but when I click the stop sign, the spiral appears to shrink.
I didn't like that first straight segment followed by an abrupt left turn, so I set STEP to 1 initially and added
to the FOR loop. (Took me a while, because you hid the MAX and MIN blocks!)
P.S. Yeah, I should have also decreased the turning angle to make it really correct...
Sorry for that, my spiral is based on spiral of Theodorus, so that's how it should look...
I found it was so much kind of spirals here !
You probably want the Archimedean spiral (also arithmetic spiral )
What do you mean?
If I stare at it while it's spinning, then click the stop sign, the picture on the stage looks as if it's getting smaller. Optical illusion.
PS That Wikipedia article does have a continuously interpolated version. :~)
or you were hypnotized ! It work !