We own this very attractive travel mug that’s a perfectly smooth cylinder. Even the lid consists of uninterrupted circles, with the drink and vent holes hidden beneath a circular ridge. The net result is that there are no “drink here” affordances indicating the proper orientation of the mug for spill-free drinking. Drinking from the cup any other way guarantees an unpredictable flood of coffee and a spill.
Never one to throw away a perfectly bad coffee mug, I added my own documentation with a Sharpie. Nailed it!
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