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There are lots of different spirals and lots of different ways of creating them.
One way of making a spiral is by following the instructions to make Archimedes' Spiral.
Another type of spiral is a Golden (or Fibonacci) Spiral.
Can you see how this one has been made?
When you've looked carefully at the picture and thought about this, have a look at the instructions for making a Golden Spiral:
What do you notice about these spirals? Are they similar?
Can you create any more rules for making your own spirals?