Object properties control the appearance and behavior of objects, and are used to organize a drawing.
Every object has general properties including its layer, color, linetype, linetype scale, lineweight, transparency, and plot style. In addition, objects have properties that are specific to their type. For example, the special properties of a circle include its radius and area.
You can set some properties of an object either by layer (ByLayer), or by specifying the property explicitly, independent of its layer.