Art houses: Lisbon graffiti - in pictures

The Crono Project is creating street art on a massive scale. This corner building shows work by Os Gêmeos and Blu Photograph: Leonor Viegas

Os Gêmeos are twin brothers from Brazil, known for their yellow-skinned characters Photograph: Rachel Dixon/Guardian

The curved corner of the building is put to good use Photograph: Rachel Dixon/Guardian

Rachel Dixon standing in front of the piece by Blu, giving a sense of the scale of the work Photograph: Rachel Dixon/Guardian

Lucy McLauchlan's art in action Photograph: Alexander Silva

The crocodile on the left is by Ericailcane, an Italian artist Photograph: Alexander Silva

Brightening up the bricked-up windows
Photograph: /Alexander Silva

A giant thief in the night by Sam3 Photograph: Rachel Dixon/Guardian

A close-up of Sam3's work Photograph: Rachel Dixon/Guardian

Work by ARM on the Avenida da Liberdade Photograph: Alexander Silva

Part of the Galeria de Arte Urbana, an area in Lisbon where graffiti artists can operate legally Photograph: Rachel Dixon/Guardian

A monkey points the way to the Castelo de São Jorge Photograph: Rachel Dixon/Guardian