An ofrenda is an offering placed in a home altar during the annual and traditionally Mexican Día de los Muertos celebration. It is usually created by the family members of a person who has died and presented in ones home to commemorate the souls of loved ones in the family. A typical ofrenda is a simple concept and consists of a set of items that will identify the person to whom it is dedicated along with staples of the celebration such as pan de muerto, a traditional sugary pastry adorned with bone and skull shapes made from the same bread, and marigold petals. The items that identify the person will include photographs, personal items that belonged to them, but can also include food other than the traditional one which the person in question particularly enjoyed. A common format for an ofrenda contains three levels or tiers. The topmost tier identifies the dead person who is being invited to the altar, frequently with photos of the deceased, along with images of various saints, statuettes of the Virgin Mary, crucifixes, etc. which are positioned in a retablo that forms the back of the altar. On the second tier are things placed to encourage the dead to feel at home and welcome, such as their favorite foods, drinks, and personal items. The third tier is set up so that the returning dead can refresh themselves upon arrival at the altar, with water, candles, and cleansing copal incense that is said to ward away evil spirits. The ofrenda typically features types of decorations that are representative of the four elements. For example, candles are lit on the table to symbolize the element of fire, papel picado represents the element air because it is so lightweight, you can see how the wind moves it, food represents the element earth, and glasses of water represent the element of water. The significance of the ofrenda is that it is left for the souls of the deceased to come back and be able to enjoy their worldly pleasures once more.