Bob the only way to open it is to bring something through it.

You can bring a casserole but not a steak.

You can bring carrots but not celery.

You can bring three or thirteen but you can't bring ten or twenty.

You can't bring Democrats, Republicans, Independents or Libertarians, but you can bring Green.

You can bring William and Harry but not Elizabeth and Charles.

Do you know what you can bring through the Green Glass Door?