If you wear glasses, you’ll have noticed that the lenses steam up practically the second you don a mask. The internet has been full of hacks and tips for months now, but the fact is that a simple anti-fogging kit from Zeiss solves the problem in a couple of puffs of spray. To prove it, Zeiss teamed up with its agency Gyro to install a large transparent panel on a viewpoint in Montmartre, Paris. A spectacle-shaped section was treated with anti-fogging spray. A blast of hot air on a cold day quickly caused the panel to mist over – apart from the section spritzed with Zeiss’s magical liquid. The message was clear.