This spiral is found in many places in the natural world
For a detailed account see https://en.wikipedia.org/wiki/Fibonacci
The original design for the house is based on a Fibonacci spiral
The spiral is derived from the Fibonacci series: 0,1,1,2,3,5,8,13,21......... adding two numbers together to produce the next.
If you divide one Fibonacci number by the previous one you get this series; 1,2,1.5, 1.67, 1.6, 1.625, 1.615, which as you go on gets closer and closer to 1.618 - a number known to the Ancient Greeks as the golden mean. It was used in many of their greatest buildings, and has been used by modern architects such as Le Corbusier.
Dick's house in France