The gliders can react with each other in many different ways; a large number of the reactions cleanly destroy both gliders leaving nothing. Many of the remaining reactions cleanly create some common objects, and so are used as the first steps in glider syntheses or as part of constructing interesting objects using rakes. Only a small number of collisions can be considered dirty due to creating multiple objects or a mess.
Here is a list of the possible results along with how many different ways they can occur (ignoring reflections and rotations).
|Lumps of muck||1||0|
|Four skewed blocks||0||1|
The messiest of the two-glider collisions in the "dirty" category is 2-glider mess.
|All 71 distinct 2-glider collisions, arranged by what they synthesize in a pattern constructed by Jason Summers|
(click above to open LifeViewer)
RLE: here Plaintext: here
- The direction requirement is a necessary but not sufficient condition for the 2-glider collision to be valid. For two gliders in the same direction, they either do not interact forever, or collapse in at most 4 ticks due to being very close. In the latter case, the gliders cannot come from infinity and this "collision" is deemed invalid. Glider syntheses should avoid such glider pairs.