In many cases picnic tables were used specifically to restrict human impacts on the surrounding natural area, and were accordingly designed to be as heavy and immovable as possible. Initially, a variety of picnic table designs were attempted. A sawbuck table with detached benches was popular in the early 1920s, but proved unsatisfactory in public parks because the benches tended to disappear. Other designs failed because they were either structurally unsound or difficult to construct. The classic A-frame picnic table design, which overcame these early difficulties, originated at Lassen National Forest in California in 1926, and was accordingly known within the US Forest Service as a "Lassen table". The now-iconic Lassen tables became common across the United States through the work of the Civilian Conservation Corps in the 1930s. The first known roadside picnic table was erected in 1929 in Boston Township, Michigan, using planks reclaimed from highway guardrails. Uses Picnic tables are used for dining, resting, crafts, and other activities. Picnic tables can be found outdoors in many public parks, residential back yards, rest areas, campgrounds, amusement parks, and many other places. Picnic tables are also used indoors when it is desired to have attached seating to tables. Urban In urbanized environments, picnic tables are often used as street furniture, and provide a convivial setting that can make it easier for neighborhood residents to interact with one another. In areas without adequate spaces, picnic tables placed on people's front yards have been used to similar effect. Picnic tables are also used to provide informal outdoor dining for food trucks and other small restaurants that lack indoor seating. Outdoor Picnic tables are widely used in outdoor learning because they provide convenient combination of seating and a flat work surface. They have also shaped the outdoor educational profession in other ways: in 1983, at a meeting of the Association of Experiential Education, women educators met around a picnic table at midnight to discuss the problems facing women in the field of outdoor education. The picnic table dialogue subsequently spurred a broader conversation and greater visibility to these issues in outdoor education. The informal, outdoor character of picnic-table interactions has lent them to non-recreational uses as well. Israel and Jordan, while formally at war, held a series of secret talks between engineers regarding riparian issues at a picnic table at the confluence of the Yarmuk and Jordan rivers. In 2009, a playset