Select Behind

To select an object hidden behind another object, select the top object, and then press Command-Option-left bracket ([) (PC: Control-Alt-left bracket). That will select the next object, below the selected object. Keep pressing the same shortcut to select the next object down. To select back the other way (Select>Next Object Above), press Command-Option-right bracket (]) (PC: Control-Alt-right bracket). In our example, we selected the top object (part of the face), and used the shortcut to select the next object below.