Fibonacci
Before we left for Paris I reread The Da Vinci Code. The twists of the plot line repetitively find a home in the Fibonacci sequence, a mathematical integer sequence where the first two numbers are 0, 1 and all subsequent numbers are the sum of the preceding two. What is truly staggering is the number of places you can see this form represented in nature, music, art, etc.
One of Many
One of many places I spotted the expression was in the spiral staircase that takes visitors to the top of the Arc de Triomphe. What made it stick out to me was the slightly golden color of the stairwell which was bathed in some sort of halogen light. Enjoy!