poland-based hugon kowalski + adam wiercinski + borys wrzeszcz have designed ‘sky street’, a submission for the ac-ca international competition to produce a car park tower situated in the dense urban district of hong kong. he proposal intends to create parking spaces which are an extension of the street. the typical city street complete with traffic lanes, parking spaces, sidewalks and trams were taken and shaped the building form. comprised of two intertwined spirals which seamlessly merge at the top of the structure, the configuration supports collision-free circulation while defining the external appearance with visible contours from the upward outer ramp with a mirrored downward internal ramp. at the midway point, a connection across the center void allows cars to transition and continue driving in the same direction.