Knowtex

The author of the video demonstrates here the stroboscopic effect by filming water flowing from a hose taped to a music speaker.

We can never really be aware of or live in what we call "now". Because it takes time for our brain to process the information about what's happening now… and it takes time for that information to get from the rest of our body to our brain. So, we live in the past!

Erik Johansson creates realistic photos of impossible scenes -- capturing ideas, not moments. In this witty how-to, the Photoshop wizard describes the principles he uses to make these fantastical scenarios come to life, while keeping them visually plausible.

Does language affect how we perceive colors? People from the Himba tribe describe colors in a way that make them see the world differently from what most people do.

Simple optical illusions can make it seem like the progress bars on your file downloads are moving faster than they actually are.

Watch what happens with these dogs (no camera tricks or special effects... just an illusion).

Dans cette étonnante illusion, une animation est créée à partir d'une seule image contenant des raies verticales : celles-ci, vues à travers un cache en mouvement, dévoilent les différentes images-clés de l'animation.

Watch what happens with these diamonds? (no camera tricks or special effects used here... just an unbelievable optical illusion)

Replay this video several times: you will hear an amazing audio illusion...

What are the mental loopholes that make us see a woman get sawed in half while we know it's just impossible? These cognitive illusions have been used by magicians long before any scientist identified them... until now!