涂鸦原本是人们随意取材,信手涂抹的绘画行为。原始时代的洞穴壁画和岩画,因其直接、粗率,可视为人类最早的涂鸦艺术。古典画家的手稿,亦可见出人们对信手涂鸦的爱好。达·芬奇在《论绘画》中认为,艺术 Graffiti was originally a random drawing of people, hand smeared painting behavior. Cave murals and petroglyphs of the primitive era, because of their direct, crude, can be regarded as the earliest graffiti art of mankind. Classical painters’ manuscripts also show people’s interest in graffiti. Leonardo da Vinci in the “theory of painting” that art