Broccoli that we enjoy on our tables is the blossom of a flowering plant, and this is nowhere more apparent than with Romanesco Broccoli, shown in extreme close-up below. 

The little spiral flowers on the Romanesco Broccoli are created with rotations. The number of rotations for each one is a number in the Fibonacci sequence. This is the famous sequence named after thirteenth century mathematician Leonardo of Pisa, better known as Fibonacci: each Fibonacci number is the sum of the two preceding ones, so 0, 1, 1, 2, 3, 5, 8, 13, and so on.