Altered signs in Madrid are the mainly the work of two different artists. The first is a local that goes by the name Yipi Yipi Yeah, or YYY for short. The second is Clet Abraham whose work is found in most large European cities. Searching for these signs can make a game out of walking around a city!
below: A YYY sign, “pais apatrida busca asilo” while wearing a Spain T-shirt that says “Spain is different”. The words on the white bar translate to “stateless country seeks asylum”

below: Another Yipi Yipi Yeah sign with a Spanish theme -this time a crowd is cheering as flour black bulls go after other people.

below: A single matador on the crosswalk with his red cloak leading the way.

below: A yield sign becomes cleavage that is barely held together by a couple of pieces of lace.

below: Fishing. The word is perdigon, a young partridge. I’m not sure if it part of YYY’s work.

below: Swinging on the one way sign.

The next few are by Clet Abrahams.
below: A similar sign appears in an earlier post on altered signs in Paris.

below: Skateboarding on Calle de Fucar.

below: Black dog pees against white wall.

below: Romeo, Romeo, wherefore art thou?

below: Chiselling away at the mouth, an artist at work.

below: Good morning sunshine.

below: There are a few signs that are the work of an unknown person, including this xenofobia stencil.

below: And last, also by an unknown person, are these eyes watching over the street.

other altered sign pages:
Florence,
London,
Paris