Snacker on 38P7.2 is a period-63 oscillator composed of a snacker and 38P7.2. Although it is composed of two oscillators of smaller periods (9 and 7 respectively), it is considered non-trivial because it has a single cell that is alive in generation 5 and dead in the other 62 phases of the oscillator. In terms of its 78 cells, it is the smallest known non-trivial period 63 oscillator.
Generation 5 reveals the single cell that oscillates at the full period (in green).
A variation of this oscillator with a slightly larger bounding box of 26×20Download RLE: click here