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Assassin’s Teapot

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The assassin's teapot uses concealed holes to allow a server to pour liquid from several reservoirs.

The trick relies on air pressure and surface tension to hold liquid in (and keep air out). Here a wire mesh over the bottle's opening means that surface tension resists the inflow of air, thereby keeping the water in the bottle.

Here a 3D-printed cutaway version of the assassin's teapot shows how it works.

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