In his 1919 essay 'The Uncanny,' Sigmund Freud described the uncanny as belonging to "two sets of ideas, which, without being contradictory, are yet very different: on the one hand it means what is familiar and agreeable, and on the other, what is concealed and kept out of sight."
Cut to present day, where across urban landscapes young and old, a new kind of explorer is emerging - crawling through holes in fences, squeezing between slabs of concrete and rebar. With camera in-hand, they gain access to places seen everyday but considered off-limits or forbidden, and so forgotten. They find the strange in the familiar, and vice versa.
Place-Hacking is like an extreme version of urban exploring. Even the name is uncanny, pushing us to think of the analog world in terms borne of the digital age. Bradley Garrett, the man at the heart of it all, used it as the title of his thesis while studying Technological Natures at Oxford.
That project has since culminated in his new book 'Explore Everything: Place-Hacking the City.' Packed with photos and stories of his adventures at the edge, suffice to say it's not your typical research paper.
So grab a camera and have a look around. Seek your hidden city.