A two-dimensional Ising model is presented in order to reproduce cloud field organization at the mesoscale (i.e., from 10 up to 10 km). This model takes into account different interactions between an air mass and its environment. It is shown that this novel and original approach allows to reproduce quite well satellite observations. Although created initially for pristine (i.e., natural) oceanic conditions, this model can be adapted to any other situations, mutatis mutandis.