The term 'antique' is most closely connected with something that is old. This old item however has value because of its utility, emotional connection, rare nature etc. Various types of antiques are treated as collectibles and hence the value increases as the time of its longevity increases.
If we look at antique paintings it is very familiar to us that they are of high value. Most commonly the painting Monalisa is a class on its own. It is one of the most famous antique piece of art that is there in the world and we do know its worth. Aesthetic sense of people is very important when one deals with art and culture. Antique paintings are items of culture and its security tells us about its worth.