It's pretty scary when you look down a pricelist for televisions and find one for 662,000 euros, or somewhere vaguely north of a million bucks. What's even scarier is finding that the next telly on the list is marked 'price on request'.

C Seed specialises in tellies designed for the decks of superyachts, for the grounds of $5000-a-night resorts and for the living rooms of people who have enough space for a telly that's wider than the great bulk of living rooms, indeed wider than a significant number of homes. But what caught my eye was the neat technology behind them.

For a start they're awfully big. Maybe you think a 190 cm, or 75-inch, LCD screen is large enough to boast about. C Seed's 262 will make you pull your head back in. It's 262 inches, or 6.65 metres, and is claimed to be the world's largest 4K LED television. It's 6.14 metres wide by 2.57 metres high and if that sounds too big to get through the front door of your cute inner-city terrace fret not, there are a couple of smaller versions with screens of 197 and 157 inches, about five metres and four metres. Prices start at 389,000 euros, or $625,000.

The really tricky technology comes with the screens designed for outdoors and for the superyachts. In this case they're made up of five to seven vertical segments that concertina together, at the touch of a button on the remote, and then retract into the ground (or deck, if you're an Onassis). They're a smidgin smaller than the solid indoor screen, with a screen size of just 201 inches, or 5.1 metres, but they are weatherproof.