If you go to Google on your mobile device and search for [bubble level], Google will provide you an interactive leveler. It clearly is using the mobile devices’ instruments to determine if the phone is level, which lets them provide this bubble level tool directly in the search results.
I put together an animated GIF of it in action:
This was spotted by a reddit user just the other day.
I would classify this as more of an interactive calculator tool versus an easter egg, both of which Google has plenty of.
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