Welcome to "Binomial coefficient as a marble run – Mathematics to touch”! In this article we present an innovative marble run based on the modular system Marble Castle. This special marble run works similarly to a Galtonboard, but the marbles do not fall by chance, but always alternately to the left and right. This results in an exact binomial distribution that vividly illustrates the concept of Pascal's triangle. Immerse yourself in the world of mathematics and discover how playful learning works!