The movement of plants always has meaning. It is us that gives the meaning. Japanese say the Ojigi-So bows every time we touch it. Indonesians think that Putri Malu always nods as if it nods shy every time we touch it. Mimosa Pudica is so sensitive, it is said that the movement is to avoid danger from animals and some insects, because animals are scared of plants that move. Mimosa Pudica bows, nods or closes its leaves and hangs down in response to light, darkness, wind, vibration, touch, and also responds to electrical stimulation. (Bose, 1918). So, you can have Mimosa Pudica in your room as a motion sensor or an electrical hazard sensor in the daytime. 😀
I remember in elementary school, every time I touched Mimosa Pudica too roughly like a bully kid who was excited to see the foldable leaves, I got hurt by its thorns. Actually, the meaning of the shy princess movement was so obvious, she had a message, "Don't touch me!"
LINKS:
https://onlinelibrary.wiley.com/doi/full/10.1111/j.1365-3040.2009.02066.x
http://darwin-online.org.uk/content/frameset?viewtype=text&itemID=F1325&pageseq=1

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