This is a Processing sketch which demonstrates the interference of humans with nature. The sketch is connected to a Lilypad Arduino controller with a light sensor. If the light sensor is covered (and the plants receive no light), the branches stop growing and glitch instead. You can see this occur at 0:33 when the user covers the light sensor and then lets go at 0:37. As soon as the light sensor goes uncovered, the branches start growing again.
The branches are drawn using the computer science concept of recursion. As such, this is also a study of recursion.
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