0+1 = 1
and so on.
The tiling below is formed with squares having side lengths of successive Fibonacci numbers. The spiral then consists of 90 degree arcs connected along adjacent squares' opposite vertices.
The 20th Fibonacci number is 6765.
The coolest thing is this: the ratio of any two consecutive Fibonacci numbers is approximately 1.618, commonly known as the Golden Ratio. :-)
|Look at the sunflower model to see the Fibonacci curves|