Mitosis and Cytokinesis
The process in which cells divide, thereby producing more cells.
“Mitosis is the process by which a eukaryotic cell separates the chromosomes in its cell nucleus into two identical sets, in two separate nuclei. It is a form of karyokinesis, or nuclear division. It is generally followed immediately by cytokinesis, which divides the nuclei, cytoplasm, organelles, and cell membrane into two cells containing roughly equal shares of these cellular components.[1] Mitosis and cytokinesis together define the mitotic (M) phase of the cell cycle—the division of the mother cell into two daughter cells, genetically identical to each other and to their parent cell.”
http://en.wikipedia.org/wiki/Mitosis

This is a data visualization, but it plays on cell division. I just really like this one :3

Neural networks
I’ve always had an interest in nerves, the nervous system, and neural networks in general.
“A biological neural network is composed of a group or groups of chemically connected or functionally associated neurons. A single neuron may be connected to many other neurons and the total number of neurons and connections in a network may be extensive. Connections, called synapses, are usually formed from axons to dendrites, though dendrodendritic microcircuits[2] and other connections are possible. Apart from the electrical signaling, there are other forms of signaling that arise from neurotransmitter diffusion.”
http://en.wikipedia.org/wiki/Neural_network

Below are some pretty cool visualizations. The lower one was done in Processing.

Heliotropism
When a plant moves its flowers and/or leaves to face the sun. Not to be mistaken with Phototropism (or directional growth, in which the plant grows toward the sun).
Heliotropic flowers track the sun’s motion across the sky from east to west. During the night, the flowers may assume a random orientation, while at dawn they turn again toward the east where the sun rises. The motion is performed by motor cells in a flexible segment just below the flower, called a pulvinus. The motor cells are specialized in pumping potassium ions into nearby tissues, changing their turgor pressure. The segment flexes because the motor cells at the shadow side elongate due to a turgor rise. Heliotropism is a response to blue light.
http://en.wikipedia.org/wiki/Heliotropism

Arctic poppies!

Some generative art
While browsing the internet for heliotropism and generative art I found this little piece called Silk.

http://new.weavesilk.com/
http://weavesilk.com/