Designed by Piet Blom and built from 1978 to 1984, this mind-bending development facing the Markthal Rotterdam is marked by its pencil-shaped tower, De Kolk , and 'forest' of 45-degree-tilted, cube-shaped apartments on hexagonal pylons. One apartment, the Kijk-Kubus Museum-House , is open to the public; the Stayokay Rotterdam youth hostel occupies the supersized cube at the southern end.