@watchhiddenpurpose: Why put a hole in a pen that's supposed to hold ink? On a BIC Cristal, that tiny barrel vent balances pressure and helps the ink keep flowing. Not the cap hole, that's a different feature. Built in. On purpose. Source: BIC Cristal technical press kit. Visual excerpts: Primal Space and desicons. Airflow diagram simplified. #HiddenPurpose #EverydayDesign #HowThingsWork