Ключевые слова: adult, african, arm, attention, background, body, body part, business, choice, chroma key, click, count, cursor, finger, fingernail, first, fist, forefinger, gesture, gesturing, green, green screen, hand, hand gesture, human, index, isolated, male, man, manual, move, number, one, person, picking, point, pointer, pointing, presentation, push, right, screen, show, showing, sign, simple, single, success, technology, touch,