Pythagoras once said "All is number". Well, it's true!
Why does the sum of these two mysterious symbols 2 and 3 equals to 5? Well, what defines a number is related to its calculations. People can "calculate" numbers and that's how we define numbers. If it can be "calculated", it is a number. Thus, numbers are defined by calculations.
Richard Feynman discovered a ground breaking rule regarding the sum of particles, which means that we can actually "calculate" them. This rule led numerous mathematicians to claim that particles can also be considered as numbers.
But guess what? Our universe is made out of particles! If so,
"All is Number".