Look! Up in the sky! It's...it's... it's an amazing optics display

It's funny what tiny little ice crystals can do. Floating high in the air, suspended by air currents, they hang there... and then a ray of sunshine enters them. The light gets bent due to complicated physics, the interplay of that beam of light passing from air to a solid crystal and out again. But once that beam leaves, the sky can light up with a wizard's pattern of colors and shapes. And if you're very, very lucky, you'll see something that you'll remember the rest of your life. Something like this: