Impossible? No, just unlikely.
The Happiness Sadness ambigram shown here is a fairly long asymmetric ambigram (also known as a symbiotogram) that will definitely make you take a closer look!
As you can see from the preview, this design reads 'Happiness' when upright and reads 'Sadness' when upside-down.
Take it for a spin. Simply move your mouse over the design, or swipe it on a touch-screen to see what it looks like upside-down.
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