How could Beethoven compose if he was deaf?

Beethoven's ability to compose despite his deafness can be attributed to his profound understanding of Music Theory, his innate musical intuition, and his ability to hear music in his mind. He often used a technique called "bone conduction," where he could feel vibrations through his body, particularly using the piano. Additionally, he relied on his memory of sound and the intricate musical structures he had developed over his lifetime. This combination allowed him to continue creating masterpieces even after losing his hearing.