Perfect for a pop-up market in Seoul that appears only overnight and on weekends, these collapsible and stackable structures take up little space when not in use and can be deployed and stored quickly and easily.

Designed by Motoelasico for the capital city of South Korea, the temporary tents provide space for craftspeople and designers to set up shop and sell wares. Then, during the week, the units can be left on site without taking up public space.

Two site-specific variants were developed for two locals along the Han River. One site is narrow and long, and its design solution consists of a series of foldable ‘V’ structures on wheels covered with orange tarps.

Each unit houses three vendor booths with roll-up sides to for visibility and ventilation. The fronts and backs are open allowing views through to the river behind the sellers as well.

The other site is a broader and more built-up area of benches and greenery, and its solution draws on the model of stackable supermarket carts. Booths are independent and pyramidal, but can be slid into one another for storage.

These yellow-clad units have more flexibility in this less-linear space, able to be arrayed around corners and arranged in different ways depending on demand.

While both are responses to a particular place and set of needs, they also serve as a useful model for other cities looking to create open-air markets — simple, durable, practical but also fun, colorful and inventive.

Walk right out onto the surface of the sea or follow a path that takes you into a tranquil space beneath the waves at the ‘Thematic Pavilion,’ a mostly-submerged nautical exhibition space envisioned for South Korea. Daniel Valle Architects intentionally give the structure an uneasy, delicate sense of equilibrium with the water, drawing parallels to the realities many coastal communities could face in the not-so-distant future as sea levels rise. A visitor’s experience changes depending on the state of the water, with paths appearing and disappearing.

The pavilion features subtle raised areas offering clear paths that remain above the surface even when water levels are high and, presumably, when rocked by the wake of a nearby ship. In much the same fashion as a submarine, a water tank keeps the ship-like structure submerged for exhibitions featuring water-based technologies, and raises it above the surface afterward so it can be used like an ordinary boat.

The exhibitions themselves range from the dazzlingly visual, like water shows, to the technical, like hydraulics and cooling systems. “The design aims to raise people’s attention on the ocean and coastal environmental crisis,” say the architects. “The design hopes to provoke the deepest impression to the visitors and prepare them for information and critique on all issues related to the oceans and coastlines. The beauty of scene after visiting the exhibition space and returning to the top plaza will contribute to develop an optimistic conclusion.”

While it seems like a lack of railings could lead some people to walk right off the edge, people in other areas of the world don’t seem to require the same kind of safety hand-holding as Americans, so maybe they’d be fine. The renderings look especially cool after dark, with illuminated water spouts shooting up into the sky. Though the proposal wasn’t chosen for the Expo 2012 in Yeosu, it’s an interesting idea that could provide inspiration to other structures blurring the lines between architecture and ship building.