Plants movements We think plants are sessile organisms but are they really sessile? Most of the plants' roots hold the soil very tightly and look like sessile however they have a very dynamic life. During the day, they react to the sunshine, the gravity, the wind, the organisms, etc. Also, they have the movement called circumnutation which means their shoots move in a path during the day. Darwin had lots of experience about circumnutation and their experiences grounded to his insomnia. Because, in his time, he didn't have the change to record all the plants' movement with cameras so he decided to put a glass on above the plants and put a mark on the glass when the leaf moved. At the and of the day he had a diagram for that specific plant's movement. Plants have a more interesting life than we thought but they don't like to show us. Maybe they don't even care for us as much as we care about them.