This is only a part of generation 102 of the so-called f-pentomino,
which doesn't stabilise before the 1,103rd iteration.

!Game of Life

The Game of Life is an invention of the English mathematician John Conway. It simulates the evolution of dead and living cells. Grids can be of any size and any rate, with a maximum of 600 x 600. Create your own shapes by clicking the mouse, or by importing predefined ones. You may save your own creations in a special Shapes directory. The program comes with a collection of nearly 1,000 predefined and often very interesting shapes.
!GoL no longer needs the font Selwyn to be present.