English: Hollow ceramic artifacts can serve as thermometers for tea brewing, when hot water poured on the head of the zisha ceramic pee-pee boy triggers a water jet. The jetting distance correlates with the water temperature. Frame rate is about 1 s.
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This is Fig. 1b from
Lee, Vincent; Attinger, Daniel (2016). "Thermodynamics and historical relevance of a jetting thermometer made of Chinese zisha ceramic". Scientific Reports. 6 (1). doi:10.1038/srep28609.
Not that Fig. 1a specifically is labelled as not falling under the CC BY license that the article is under, which the uploader interprets to mean that the article's license does apply to Fig. 1b.