Karl Simon visits Highgate Cemetery to show us the importance of contrast in black-and-white painting on a tablet.

And eagle-eyed viewers have noticed a black and white square in the right-hand corner of the screen ever since. Here's what you need to know about the mystery square.

Superhero fans were recently treated to a throwback aspect ratio when WandaVision opened its run with the yesteryear sitcom screen of 4:3 - the glorious black and white square that viewers saw on ...

Why did Channel 5 introduce the black square? Channel 5 has not revealed why the black and white square has been appearing in the corner of our TV screens.