Somebody taught me this circuit in my childhood and I haven't forgotten it ever since.
If you close SW1 first, Lamp1 will light at full brightness, then if you turn on SW2, both Lamp1 and Lamp2 will light at full brightness.
If you close SW2 first, still Lamp1 will light up first at full brightness, then if you turn on SW1, both Lamp1 and Lamp2 will light at full brightness.
I shall be amazed again and again. :-)
I find it smart but once upon a time somebody told me that he can do this priority switching using fewer contacts.
Do you think it is possible? I could never find a simpler solution with switches and wires.