The Left, Right, Top, and Bottom properties on AxisAlignedRectangle return the absolute position of the respective side.
The following code shows how to get the four values (Left, Right, Top, and Bottom):
Setting Left, Right, Top, and Bottom results in the X or Y values of the AxisAlignedRectangle changing. These values will not change the Width or Height of the AxisAlignedRectangle. To change dimensions use the Width and Height.
The following code makes an AxisAlignedRectangle named RectangleInstance position its bottom-left corner at the origin (0,0):