Gosper's Breeder is a pattern in the Game of Life.
The Game of Life is a cellular automaton invented by John Conway in the late 1960s.
I write about it in my book Alex Through the LookingGlass: How Life Reflects Numbers and Numbers Reflect Life: http://www.amazon.co.uk/dp/1408817772
The book has the US title The Grapes of Math:
http://amzn.com/1451640099