Shadow of the Colossus Hints

How do I get through this gate to the colossus?

  • 1 of 4: Look at the center of the gate.  What is that?
  • 2 of 4: It's a lens.  What would you do with a lens?
  • 3 of 4: Focus sunlight through it.
  • 4 of 4: Use your sword to point to it.