sentence: common design elements include : top surfaces of various shapes , including rectangular , rounded or semi-circular legs arranged in two or more similar pairs several geometries of folding table that can be collapsed into a smaller volume heights ranging up and down from the most common range , often reflecting the height of chair or bar stool used as seating for people making use of a table , as for eating or performing various manipulations of objects resting on a table presence or absence of drawer expansion of the surface by insertion of leaves or locking hinged drop leaf sections into horizontal position .