The 'island-peninsula' phenomenon of the fractal diffusion front in a bidimensional medium obtained by means of a random walk process [Le phénomène 'île-presqu'île' du front fractal de diffusion dans un milieu bidimensionnel obtenu grâce à un processus de marche aléatoire].
If this last point moves to the right-hand side neighbour site -that belongs to the "Sea" (blue)-,
then the very small red subset disconnects itself from the "Shore" and becomes an "Island" when
conversely the very big red "Island" connects itself to the "Shore".
See the whole lattice.