The symbols of the floor plans are different in case of doors, windows and walls where the function and position are clearly indicated. Structural and partition walls are normally represented by thick or double lines which depict walls. The doors are depicted by a straight line and curved arc meaning the direction of the swing of the door and the amount of space it requires to be opened. This assists in movement and placement of furniture. Windows are represented as a slim line between the wall lines and the parallel lines tend to indicate the thickness of the window. Such symbols enable anyone reading the plan to know how the rooms are interconnected, where the light comes into the building, and the movement of people in the space. The process of learning the floor plan symbols of these elements will enable you to learn how a flat drawing represents the actual building layout, and make better designing and construction decisions.