All in a flight - Optics events imaged by Steve West (Steve's Atmospheric Optics) February 2009. ©Steve West, shown with permission.
Below, optics of a different kind. Cloud shadows and the intervening rays appear to converge to a point on the landscape below. The point is the antisolar point directly opposite the sun. The rays and shadows are all parallel but the same perspective that makes railroad tracks or a road converge towards the horizon operate in the sky. Unlike most optical effects, the rays and shadows are tangible 3D objects - imagine them here as long parallel rods extending away from you and the scene will take on its 3D reality.