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Muglexia
Inversion and flipping of letters and words is common when reading for dyslexics and is one of many reasons why dyslexics have trouble when learning to read. I still have letters such as 'p' and 'b' (amongst others) which flip when reading and writing.
These three mugs illustrate inversion and as a result are more stable and more balanced in the hand because the handle position being (upside down and) lower down than normal. This gives a more comfortable pour when drinking due to where the centre of gravity is. They are also more stable in general and less likely to be knocked over. The inverted shape also keeps tea and coffee hotter for longer.