Check out the image on this article. The one towards the bottom of the page by Lucy Nicholson, with the steel cages arranged in a semi-circle. The ideal Panoptican. With a cage they can be observed from all sides as well. Totally visible. Washed in surveillance.
The Wikipedia article on the Panoptican (which was developed by Bentham) quotes Bentham as saying:
a new mode of obtaining power of mind over mind, in a quantity hitherto without example.