Cadae is an experimental Western poetry form similar to the Fib. While the Fib is based on the Fibonacci sequence, the cadae is based on the number Pi. The word "cadae" is the alphabetical equivalent of the first five digits of Pi, 3.1415. Rachel Hommel wrote an untitled "Cadaeic Cadae", which uses the cadae form as explained above, and adds a level of complexity to it wherein the number of letters in each word represents a digit of Pi.