This funny graphic shirt for physics and science geeks takes on the optimism versus pessimism trope of a glass being half full or half empty. Technically, the glass is completely full, whether it's mostly water or not, there's something else in there: air.
This simple white graphic t-shirt design pops on a black t-shirt as shown here. The design is available on a wide variety of different colors and you can also get the print on a light shirt with a black print. This is a true-to-size comfortable unisex cut tee.