How does my dog know where my ears are?

I’m pretty sure that she knows they are equivalent to the pointy things that stick up on top of her head, because she specifically washes my ears whenever she is greeting me and is able to get close to my face. This parallels the way that dogs greet each other. But my ears look nothing like dog ears, and are positioned differently on my head – so how does she know? For that matter, how do they know where other dogs’ ears are? It’s not like they are able to look in the mirror and conceptualize “ears.” So between dogs, it would make sense that it’s just an automatic thing to go for the pointy/floppy things on top of the head – but how can Molly transfer this automatic greeting-behavior to me, when I have no pointy or floppy things on top of my head? Do ears emit a particular inter-species waxy smell?