Diwali, perhaps the most widely celebrated Hindu festival of all, is a festival of lights. One tradition that has survived to this date is that of Diyas. Diyas, which are small earthen bowls such as those in the photograph, are filled with oil and lit. The diyas, which are symbols of wealth and happiness, are then arranged all around the house. It is said that if your house is lit well enough, the Goddess of Wealth will visit your home on Diwali and bless you with prosperity. Thus, people make the effort of decorating and lighting up their houses with all sorts of lights and candles.