(fos), a multidisciplinary team of interior designers and art directors based in Madrid and Barcelona, applies their creative talents to all kinds of projects, including this ephemeral façade on a Madrid restaurant. They used yellow tape to create the illusion of a beam of light.
Applied outdoors, this idea is ephemeral because the elements will degrade the tape. We see it as a wonderful idea to apply indoors.

…We’re thinking masking tape would be the best, impermanent bet, unless you’re sure you want to live with it. Googling “yellow masking tape” yields a trove of hues. Japanese washi tape offers lots of possibilities.

Swell!
via Design Milk
Why tape and not paint? Is it supposed to be temporary?
Yep. I think that was the idea ALTHOUGH, if paint would certainly be swell…