This week’s best city stories from around the web discover cyclists pretending to be cars in Riga, a mobile cinema creating public spaces in Brussels and a plan to make streets into canals in Boston. We’d love to hear your responses to these stories and any others you’ve read recently, both at Guardian Cities and elsewhere: share your thoughts in the comments below. Is it a bike? Is it a car? Last week saw the battle for segregated bike lanes in London unfold. Some of our readers suggested that if every cyclist used a car for just one day, we would see how unbearably congested the streets would become without cycling. As CityMetric reports, cyclists in Riga have undertaken a creative spin on this. Transforming their bikes into car-sized structures for International Car Free Day, the cyclists physically demonstrated how much more space would be taken up on the Latvian capital’s roads if they had chosen to drive instead. A city within a city As Minneapolis faces the impacts climate change will have on the city, a plan has emerged to build an innovative “living laboratory” in its centre. The futuristic “city within a city”, as Next City reports, will be powered by waste and include a hydroponic farm, a science park with labs, libraries, 3-D printing hubs, incubator spaces and housing. But that’s not the only thing getting Minneapolis noticed this week. Over on Grist, Heather Smith explains why the city’s bike freeways are so brilliant. Speaking of which, share your examples of the best cycling infrastructure from around the world with GuardianWitness.