Urban Cactus is a housing project on the harbor in Rotterdam by the Dutch firm UCX Architects.There are 98 residential units on 19 floors, using the pattern of outdoor spaces to determine the overall appearance of the project. Form follows function which leaves ample room from the interior living spaces for much greenery.The whole effect creates a building which appears to be living and growing with its inhabitants - A waterfront cactus.The slightly irregular pattern alternates these outdoor spaces to create more sunlight than a typical stacked composition and a beautiful design that has originality and adds vitality to citylife.