Mold-blown glass is made by blowing hot molten glass into a mold. The inflated glass is removed from the blowpipe, the redundant parts are being trimmed before it is set aside for cooling. Compared to free-blowing, mold-blown glass may carry a less liberal form but at the same time possess a subtle temperament. Its form may be bound by certain rules, but that does not stop it from retaining some undefinable properties, which in turn become its unique beauty.
Mold-blowing is a technique passed down from the Edo period but is becoming rare nowadays. Masao Koizumi is a craftsman who acquired this uncommon glass making technique. The glassware found in Japan are mostly western style. Whereas the traditional ones that feature classical Japanese aesthetics can only be found in antique markets at a high price. Koizumi thought it would be a pity to let the craft of glassware die out, he therefore decided to produce pieces that can resonate with people.
Masao Koizumi takes inspiration from the ancient glassware from the Edo period by mixing in plant ash into the glass. The final product would appear somewhat in dark green. Instead of the crystal clear transparency of normal glass, the piece carries a substantial and profound temperament.