Bulging water droplets could make for cheap and simple sensors.
Bug-eyed: this drop of water will bulge upwards if squeezed by the surrounding ring.
References
DongL., AgarwalA. K., BeebeD. J.& [author]JiangH.[/author]Nature, 442. 551 - 554 (2006).
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Smith, K. Mini lenses spy out changing conditions. Nature (2006). https://doi.org/10.1038/news060731-9
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DOI: https://doi.org/10.1038/news060731-9
