Easel refers to an independent structure designed by an artist to support a canvas (CANVAS) or a canvas (PANEL) when painting. The easel used in the painting room is usually fixed on a square or rectangular base by four hard wooden strips. The base is equipped with casters, two strong poles cross at the top, and diagonal pillars are in the middle of the back. There is an adjustable sliding groove, and its spring hook can fix and support the painting in sections; the top is fixed by a movable clip. The sketching easel is made of wood or aluminum. It is small, light and easy to carry. It can fold all accessories into a compact volume; its design is between stable and portable. The most common sketching easel has three legs, two of which are at the front, supporting the pillars of the painting, and the third leg is inclined backwards to adjust the angle of the artboard or canvas. The easel of the college or art class is stronger than the sketch easel, but lighter than the easel used in the painting room. Most easels can be folded for easy storage. Wooden easels are also divided into many types. Whether the easel quality is good depends mainly on the quality of the wood and the fine workmanship of the craftsman.