Wheel talk: Berlin's discarded shopping trolleys – in pictures

After growing up in rural Switzerland, photographer Luca Ellena was struck, after moving to Berlin, by how many things littered the city’s streets. He decided to photograph every trolley he saw and three years later he has more than 600 images, the best of which have been collected in his first book, Einkaufswagen.

‘The waste of resources when trolleys are simply discarded,’ he says, ‘and the way most people don’t even see it, for me, is representative of our times.’