The architecture of the Czech pavilion for the World Expo 2025 in Osaka, Japan, is a “sophisticated instrument for achieving a higher form of viability.” The dynamic spiral movement upwards is an allegory of the ideal life path. The sculpted form of the pavilion makes movement an essential tool for maintaining physical vitality.
The pavilion explicitly encourages the visitor to engage in some form of physical exercise, while the content compels creative engagement with spiritual and cultural values. The concept of the proposed architecture is the thesis of a space that is shaped by the movement of the body and soul.
The designed pavilion takes advantage of its exposed location at the edge of the coastal promenade and draws attention to itself in all weathers with its dominant, crafted glass facade. It recalls the rich history of glassmaking in the Czech Republic and offers unusual exhibition spaces with a changing interior atmosphere. And it shines on the outside.
The silhouette of the pavilion is significant. The frozen gesture of the trajectory of movement – the spiral – responds explicitly to the internal arrangement sculpting the external form of the house. The barrier-free spiral ramp of the exhibition space wraps around the conceptual centrepiece that is the hollow tube of the multifunctional auditorium. This, with its internal diameter of fifteen and a half metres, rises to a height of twelve metres above ground level. The exhibition ramp rises along with it, and its movement is mirrored by the ramp with seats for visitors that forms an auditorium inside the auditorium, which can be entered from several points throughout the spiral.
The spiral, wrapping around the auditorium in a logical sequence, functions as an exhibition and communication ramp serving the smooth and linear upward movement of visitors. The capacity of its exhibition space is 402 m² and the width of the ramp varies between 1.8 and seven metres. At a height of 12 metres, the ramp gives way to a spacious viewing terrace with a restaurant and bar. The added spatial experience is not only the view of the calm sea surface, but also the view through the glass skylight down into the auditorium.
A staircase, woven into the cavity of the double walls of the cylinder, provides a way down to the ground floor of the commercial building, which is also an integral part of the exhibition, where it is also its last chapter.
The conceptual idea of the load-bearing structure is a regular framing system of CLT wooden panels, which form a continuous structure consistently adhering to the chosen concept in the form of a spiral exhibition ramp, divided into thirty-six segments within a single turn around the auditorium. Regularly divided segments ensure sufficient construction readiness, demountability and transportability.
Following the overall concept of the exhibition grounds, the primary source of energy for the pavilion is electricity. Rainwater is harvested from the paved areas, which is reused after necessary modifications. The geometry of the pavilion actively contributes to the shading of the indoor and outdoor areas, with additional shading provided by integrated screen blinds. The house is equipped with a central air conditioning unit, which is located in the utility room and connected to a central cooling source.