“The most basic and simplest gesture is pointing, and it is an effective method for most people to communicate with each other, even in the presence of language barriers. However, pointing quickly fails as a way to communicate when the object or concept that a person is trying to convey is not in sight to point at. Taking gesture recognition beyond simple pointing greatly increases the type of information that two people can communicate with each other. Gesture communication is so natural and powerful that parents are increasingly using it to enable their babies to engage in direct, two-way communication with their care givers, through baby sign language, long before the babies can clearly speak.”

Link: Recognizing gestures: Interface design beyond point-and-click (edn.com)