2-glider collision

A 2-glider collision is the collision, at right angles or head-on, of two gliders. 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).

Result	Right-angle	Head-on
nothing	11	17
Beehive	1	0
B-heptomino	1	2
Bi-block	1	0
Blinker	2	1
Block	3	3
Boat	0	1
Eater 1	1	0
Glider	1	1
Honey farm	3	2
Interchange	1	0
Loaf	0	1
Lumps of muck	1	0
Octomino	0	1
Pi-heptomino	2	1
Pond	1	1
Teardrop	1	0
Traffic light	2	1
Four skewed blocks	0	1
Dirty	6	0

The messiest of the two-glider collisions in the "dirty" category is 2-glider mess.

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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

Also see

• 3-glider collision

External links

• 2-glider collision at the Life Lexicon