4.3 Z-Order
The term z-order refers to the order in which objects are drawn on top of each other. An object on top in the z-order may obscure those below it, if they overlap and if the top object is not transparent. The term z-order derives from the notion of the third coordinate axis, Z, which is imagined to extend perpendicular to the X/Y plane of the drawing toward the viewer. Objects higher in the z-order are thus “closer” to the viewer.
Objects you create are always placed at the very top of the z-order of the current layer (and if you didn’t create any new layers, this will be the top of the z-order of the entire document). For example, if you draw several ellipses, each new one will be drawn on top of the previous ones, as shown in Figure 4-4 ...
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