A mushroom-shaped percolator in green glass.

The mushroom cap is the perc — the smoke pushes up through the underside and out around the gills, which spreads it far wider than a straight downstem does. Function and sculpt doing the same job, which is rarer than it sounds.

• Mushroom-cap percolator: The sculpt is the diffuser.
• Green worked glass: Colour through the body, not applied.
• Standard joint: Takes a regular bowl.

Ships fast in plain, unmarked packaging.