Art is that means by which one expresses something that cannot be said in words. According to historians, art has existed since 40,000 BC, long before vocabulary, literature or any other means of communication. Pictures, engravings, sculptures, and sketches are examples of art in the purest manifestation of human potential. As society became more and more politically engaged, art became a symbol of protest, to challenge popular opinions, bring in revolution, and above all, it became a symbol of human emotions.