How do I get the blue wisp?

Hint 1 of 5:

The blue wisp might want to hang out in the skull near where it's floating.

Hint 2 of 5:

Try using the skull as a trap for the wisp.

Hint 3 of 5:

The wisp could fly through those eye sockets unless you do something.

Hint 4 of 5:

Put the spectacles on the skull to close the eyes.

Hint 5 of 5:

Open the skull to encourage the wisp to enter.