How do I open the door?

Hint 1 of 5:

Did you notice the spindle near the door?

Hint 2 of 5:

As you've done so many times, use the three stone disks on that spindle.

Hint 3 of 5:

Your usual combination will not work here.  See what Plato might have
to say to explain it.

Hint 4 of 5:

Only CONTRARY MINDS will enter Atlantis.