Interchange
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Interchange  
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Pattern type  Constellation Oscillator  

Number of cells  18  
Bounding box  16 × 9  
Period  2  
Mod  2  
Heat  24  
Volatility  0.80  
Strict volatility  0.80  
Discovered by  Hugh Thompson  
Year of discovery  1971  
 
 
 

Interchange is a common constellation of six blinkers.
There are two different interchanges; the more common one is displayed to the right. The less common variant has five cells between the left and right halves instead of four.
Two gliders reflected along an axis of symmetry with an even number of rows between them form an interchange. With an odd number of rows, it becomes a biblock instead.
Unlike most common sequences which require only five or six cells the minimum number of cells needed to form an interchange is seven (click above to open LifeViewer) RLE: here Plaintext: here 
See also
 Blinker
 Traffic light
 Cap, one of its predecessors
External links
 Interchange at the Life Lexicon
 Small interchange at Adam P. Goucher's Catagolue (pseudoobject)
 Large interchange at Adam P. Goucher's Catagolue (pseudoobject)
Categories:
 Patterns
 Oscillators with 18 cells
 Patterns with 18 cells
 Patterns found by Hugh Thompson
 Patterns found in 1971
 Patterns that can be constructed with 2 gliders
 Constellations
 Constellations with 18 cells
 Oscillators with period 2
 Oscillators with mod 2
 Oscillators with heat 24
 Oscillators with volatility 0.80
 Oscillators with strict volatility 0.80
 Patterns with rectangular orthogonal symmetry