Twisting has the effect of adding 1: x\rightarrow x + 1 Turning
transforms any number into the negative of its reciprocal:
x\rightarrow -\frac{1}{x} Starting at zero, the first five
moves: Twist, twist, twist, turn, twist
produces:0, 1, 2, 3, -\frac{1}{3}, \frac{2}{3}
Can you continue from there and then return to zero? You can use
the reciprocal button on a calculator (\frac{1}{x} ) to help with
the calculations.
Take another look at the video. Can you spot the strategy they
used to get back to 0?