1ℓimit – Faucet Design by Yonggu Do, Dohyung Kim & Sewon Oh. One Liter Limited 1ℓimit faucet looks more like an elegant test tube inverted on top of a tap. The glass tube holds exactly one liter of water, sufficient for a quick handwash. The theory being that we waste almost six liters of water and use only one, while washing hands. Once the stored one-liter is used up, you have to turn-off the tap till the next one liter fills up the tube. Dezain.net. Architectural Record Building Types Study | Paper Art Museum.