Architectural Culture that Channels Light and Wind, Preserving Okinawa's Way of Life.
Walking through the streets of Okinawa, you'll notice geometric concrete blocks in various places, including homes, hotels, and public facilities.
Known as "Hana Blocks," this architectural material has softened strong sunlight while allowing breezes to pass through, moderately blocking views, and creating beautiful light and shadow on buildings.
1｜Post-War Reconstruction and Concrete Architecture
After many buildings were lost during the Battle of Okinawa, Okinawan architecture underwent a significant transformation in the post-war period. Under American rule, concrete block manufacturing technology spread, leading to a shift from wooden buildings to reinforced concrete and concrete block structures.
In Okinawa, where typhoons are frequent, the climate is hot and humid, and termite damage is common, strong and durable concrete architecture became a practical choice for protecting livelihoods.
2｜Functionality Born from Okinawa's Climate
While concrete buildings are sturdy, they also had the challenge of easily accumulating heat from Okinawa's strong sunlight. This led to the need for a structure that could function as a wall while allowing light and wind to pass through.
- Softens strong sunlight
- Creates pathways for wind
- Moderately blocks external views
- Adorns buildings beautifully with light and shadow
Hana Blocks developed into an architectural material that combined functionality suited to Okinawa's climate with decorative elements that enhanced buildings.
3｜Architect Hisao Nakaza and Hana Blocks
It is widely believed that Okinawa's Hana Blocks were conceived by architect Hisao Nakaza.
Hisao Nakaza pursued architecture that was fitting for Okinawa's climate and culture, and he was involved in post-war reconstruction housing and the restoration of cultural properties. The Okinawa Hotel in Naha City still preserves early forms and prototypes of Hana Block designs.
4｜Designs Spread into Daily Life
Hana Blocks spread to residential exterior walls, fences, balconies, and partitions, becoming an architectural element that shaped the streetscapes of Okinawa.
Over time, a wide variety of patterns emerged, including circles, flowers, diamonds, lattices, plants, and geometric designs. The fact that they share the same function but exhibit different expressions depending on the creator and region is a significant charm of Hana Blocks.
5｜Towards an Architectural Culture Symbolizing Okinawa
Hana Blocks eventually came to be used not only in homes but also in hotels, commercial facilities, and public buildings. The Nago City Hall, completed in 1981, is one of the representative examples of Okinawan architecture that symbolically incorporates Hana Blocks.
Today, it is known not only as a functional building material but also as a cultural design that conveys the climate and wisdom of life in Okinawa.
6｜From Buildings to a Life with Plants
RYUKA BLOCK POT does not merely replicate existing Hana Block patterns.
It reconstructs the concept of Hana Blocks, which "allow wind to pass, soften light, and protect daily life," into the structure of a pot that delivers air and water to plant roots.
From building exteriors to indoor tables, it carries on the memory of Okinawa's wind and light into a life with plants.
References
- Okinawa TV "Okinawan Architecture Loved by a Master - Hisao Nakaza, the Originator of Hana Blocks"
- "Transformation of 'Hana Blocks' in Post-War Okinawa" Ritsumeikan University Academic Repository
- Ministry of Land, Infrastructure, Transport and Tourism "Hana Block House that Lives with the Wind"
- Yamauchi Concrete Block "Hana-gata Block"