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|Number of cells||13|
|Discovered by||Robert Wainwright|
|Year of discovery||Unknown|
By flops (or butterfly) is a period-2 oscillator found by Robert Wainwright that is extremely similar to why not: in fact in one phase it is only one cell different. It first appeared naturally in Catagolue on May 21, 2015, in a soup submitted by Brett Berger, and it was also in Andrzej Okrasinski's census.
- 13P2.3 at Heinrich Koenig's Game of Life Object Catalogs