This page simulates a biologically-inspired system with a few simple
rules. It begins with a single cell. Over time, cells repeatedly
decide whether to grow and/or split. The nearby sliders
adjust the probability of each action occurring.

When a cell splits, it creates a new cell pointed in a slightly
different direction. Decreasing the maximum turn angle causes cells to
grow in straighter lines.

Only the youngest cells get to grow or split. After a certain age,
cells become dormant. This threshold age is defined as a percentile on
the distribution of cell ages at any given time. Increasing the
threshold means more cells will be active.

Cells leave a signal in the location they were created. This effectively
broadcasts their presence so that others won’t grow or split on top of
them. Increasing the decay rate enables faster regrowth, but also makes
it more likely that cells will grow on top of each other.

When cells reach a fixed maximum age, they die.