including a wooden A-frame picnic table engraved with the names of 44 US presidents was erected on the White House lawn for the president's daughters. Later in the same year, it was reported that the Beer Summit between President Obama, Henry Louis Gates, and a Cambridge police officer would be held at the picnic table; however, the meeting was actually held at a round white table in the Rose Garden. In 2017, after the incoming Trump administration declined the offer of the playset, it was donated to a local nonprofit. A common use for picnic tables are outdoor activities, at camp sites, scenic places or common areas, but are not available everywhere. Some aftermarket picnic tables can be attached to a pickup truck tailgate, for camping, fishing, hunting, sports, barbeque, tailgate party or as outdoor computer desk. Design Shape The most traditional and common picnic table shape is rectangular, with a straight bench on each of the rectangle's two long edges. In the United States, this sort of rectangular picnic table is so closely associated with picnicking that it is the symbol used for picnic sites and picnic shelters under the Manual on Uniform Traffic Control Devices. However, many different shapes, including circular, hexagonal and octagonal designs, have also been used for picnic tables. Circular and octagonal picnic tables first became popular in California in the early 20th century because of their superior properties for playing card games. Location Most picnic tables a fixed or foldable structures, free standing or mounted to the floor and found at landmarks, scenic views or public places, for people to rest and gather. In contrast, a mobile picnic table does not have a particular spot or location, but follows around together with its platform and can be used for multiple purposes. Size A typical picnic table seats from six to eight people, though smaller and larger capacity tables exist. In particular, smaller picnic tables are often made for use by children. For rectangular picnic tables used in parks, the most common length is from . Materials The materials used for picnic tables have varied over time. A 1969 survey found that at that time, 95% of picnic tables contained wood to some extent, and 81% of picnic tables were made entirely of wood. Modern tables are increasingly often made from plastic, concrete, or metal. In addition, a combination of fiberglass and metal has sometimes