Japanese Bellows
The Japanese used a different style of bellows than the Europeans.  The Japanese bellows is box shaped, made of wood, and uses a plunger with alternating hinged doors to create a constant flow of air to the forge.  Below are pictures of the one I built.  It took approximately 3 days to build.  The dimensions are 11 1/2" wide, 22 1/2" long, and 16 1/2" tall.

Front View Handle Side

Front View Non-Handle Side

Back View

Inside View Plunger

Inside View Hinged Door