My Blackberry Is Not Working! - The One Ronnie, Preview

Can you see the number?

The world. How the world looks to a person with a red/green color deficit (deuteranopia). How the world looks to a person with a blue/yellow color deficit (tritanopia).

Some colorful hats. As seen by a person with deuteranopia. As seen by a person with protanopia, another form of red/green deficit.

Lennart Green does close-up card magic