The number of house sparrows in cities is rapidly declining. Vacant lots and rooftops offer possibilities for more suitable habitats. But this requires shrubs as shelter for the birds. Rooftops and shrubs don’t match. Their many roots require lots of soil and therefore weight. Stadsstruik (city shrub), an initiative by Walden Studio and Bureau Stadsnatuur (Office for city nature) for Citylab 010 is a research into creative ‘climbing assistance’ for creeper plants, to transform them into a much lighter form of shrubbery, where house sparrows feel at home all the same.