Introduction
This applet displays a cellular automata substrate displaying a novel type of
self-reproducing automaton.
History
This automata is a sequel to the Crystal
1D automaton.
It's based on a different principle to that of the (more common) self-reproducing
loops or worms.
Loops and worms have something in common, namely they rely on
passing each segment through a "splitter" to accomplish self replication.
This automaton works on a rather different principle. It reproduces using
synchronous template reproduction - with the synchrony provided by a counter in
each cell. Replication alternates with a stage of motion which separates mother
and daughter, so subsequent births have space to happen in.
Design
The design was inspired by the theories of A. G. Cairns-Smith.
Cairns-Smith envisages that the first organisms used the processes of crystal
growth to maintain high-fidelity information transfer across generations.
For example, some crystals grow in one direction, while preserving information
(in the form of cross-sectional area, and fault structures) between layers as
the crystal grows.
The result is a long crystal, somewhat like a stick of rock with "Brighton"
written down the middle. Then the crystal breaks in two, and the process
continues.
In the highly abstracted version here, template replication alternates with
drift away from the mother cell, to produce an environment which could support
heritable variation and evolution.
The automaton uses the Von-Neumann neighbourhood.
Interactive controls
The applet is interactive, allowing you to apply selection based on organisms
visual characteristics using a variety of implements.
- Use - tool selection - controls which type of tool to use to manipulate the environment;
- Click to - set the tool's behavior - controls how the tool in use is applied;
- Display - controls which aspect of the automata is presented;
- Size - controls how many cells are displayed, and their size;
- Show - configures how frequently the display is updated;
- Delay - configures how much delay occurs between frame updates;
- Radiation - causes random deletions;
- Mutation - causes random modifictions to the organisms;
- Step - allows a paused automata to be single-stepped;
- Pause - allows the automata to be stopped and started;
- Clear - completely blank all the universe's cells;
- Restart - resets the universe to its initial configuration;
Downloads
This applet can also be run as an application. Download this jar file (using shift-click) and double-click on it.
Source code is available - with a "no-restrictions" license. Download this zip file.