Richard Wilson's latest architectural intervention created for the Liverpool Biennial consists of an 8 metres diameter ovoid cut from the facade of a building in Liverpool city centre and made to oscillate in three dimensions. The revolving facade rests on a specially designed giant rotator, usually used in the shipping and nuclear industries, and acts as a huge opening and closing window, offering recurrent glimpses of the interior during its constant cycle during daylight hours.
More here and here including an animation