The new pavilion for the Hakone Open-Air Museum designed by Tezuka Architects is comprised of a structure entirely assembled with timber logs without any metal parts. Cutting-edge structural analysis has been employed to overcome the loads resistance variability that characterizes timber. The structure used traditional wood joints even though Tezuka Architects conceived a futuristic form.

In the interior of the pavilion a series of nets create an artificial topography for children. Nets are configured at different levels to create platforms, resting and playground areas.

The pavilion was designed to be permanent and dismountable with 100% recyclable materials. Since its completion at the end of 2009, the pavilion has gained the recognition among critics for its unconventional use of traditional materials and responsibility towards the natural environment.