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 up to the 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 a bigger part of the lattice.