We think we don’t get lost anymore. Most of the time, getting lost is replaced by searching, and buildings and destinations exist as conceptual information. But we get lost underground. At Gangnam Station, at the Express Bus Terminal, or even at a neighborhood subway station, where there is nothing special, we get lost. Why do we get lost underground? Getting lost is losing indicators. The nature of the non-individual passages that normally appear on the underground floors of cities makes it impossible to distinguish places and make us forget what's above our heads. In our minds wandering underground, the city becomes flat.
 
So, are cities flat? Rather, cities have been created and used with various layers. The connection and the flow of the city is not attached to the ground, but also exist under and above the ground. Flows of cities can break away from the simple experience of moving on the ground while touching and intertwining with each other. From elevated level, which can be seen in Seoullo, High Line Park, and the walkway of Seun Arcade, we experience different views of the city. The elevated layer continues to attract people as it is perceived by people on the ground level. This reveals non-flatness of the city.
 
The Euljiro Underpass has existed as another level within the city for 40 years. Its length is 3 km and it can meet with various urban environments. However, unlike the elevated urban level, the underground level in Euljiro isolates pedestrians from the ground. The entrance, which opens like a pore, is the only point from the ground level that recognizes the basement. The people inside are buried in the boredom of the underground passage. Can the Euljiro Underpass be freed from the flatness and entangle with the flow of the city passing over it?