Manualism is like making music with your hands. Just like how you can clap or snap your fingers to make a beat, manualism is a way to make even more complex sounds using just your hands. People who do manualism can make different sounds by tapping their fingers on different parts of their hands, rubbing their palms together, or using other hand movements. It's kind of like playing an invisible instrument with just your hands! Some people even use special gloves or wear rings to make their hand music even more impressive.