Typically you don't need to bee told what you've poured into your cup of coffee, but Japanese Twitter user Kazuhiro Watanabe (@kazuhiro_wachi) stumbled upon a clever design for drinking glasses that makes that concept pretty appealing.

The stylish coffee cups feature the kanji for coffee (珈琲, kohi) and milk (牛乳, gyunyuu) written on them.

When filled with coffee or milk, the corresponding kanji become visible, indicating which of the two you're drinking! If you pour yourself a mix of milk and coffee, then both became visible.

The stylish glasses that make pouring your morning coffee fun were created by designer Ippei Tsujio, and are available at a design event being hosted at the Shibuya PARCO department store until September 28th (as well as their online store).

Although because they're activated by a drink's color and there's only a couple options, that means if you pour yourself a glass of cola it'll tell you you're drinking coffee.