Add atmosphere and depth to your architectural sketches! Learn step-by-step techniques for drawing clouds and sky using pen and ink — perfect for making your sketches more dynamic and visually ...

Watching clouds is a solitary activity for me, even when I'm surrounded by people. If you have a drink or a meal with me in an outdoor café, my eyes will periodically turn to the sky. Every once ...

From UFO-like rings and whirlpools of light to rainbow clouds and laser lines, here are 10 strange visual phenomena that can be easily explained by science.