Cubic Houses of Rotterdam

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Kubuswoningen, or cube houses, are a set of innovative houses built in Rotterdam and Helmond in The Netherlands. Three test versions were first constructed in 1974, and in 1977 18 houses were constructed in Helmond. The houses in Rotterdam are located on Overblaak Street, and beside the Blaak Subway Station. There are 38 small cubes and two so called 'super-cubes', all attached to each other. These are designed by architect Piet Blom and based on the concept of "living as an urban roof": high density housing with sufficient space on the ground level. [Wiki]