Will the solarium GOOD ending ever be cleared?

[SL the Pyro]

the automaton ignores you. Perhaps it's not time for that?
You have added The human's skull to the backpack.

Ill-looking fellows skull.

Did you attempt this with a regular player's or monkey's skull beforehand? Just have to ask.

Okay, I just did this with a plain ol' monkey's skull and he Automaton gave the same message. I'm wondering if a human (or monkey) skull counts as a different skull from the rest, and the Automaton needs all the skull types?

...And while we're on the topic: how DO you get the Automaton to start accepting skulls? I know it's possible, but I've never been able to figure out the process.