Note that the surface tension was also measured during this water diffusion process, and did not change; therefore, only the PVA adsorb from the outer water phase, and nothing from the inside. Another setup was used: it simply consisted to deposit of drop of 1-octanol on top of a solution of water and PVA. Here again, when no polymers were added to 1-octanol, the drop simply floated and remained transparent at the surface. When PVP was added in 1-octanol, we observed that water droplets instantaneously get incorporated in the oil drop. Moreover, in this setup which includes an interface with air, evaporation of 1-octanol occurred and induced Marangoni flows within the oil drop . As a consequence, the smallest incorporated water droplets get trapped in the toroidal flows and follow the Marangoni-driven recirculation. In parallel, a large water droplet stays in the center of the oil droplet. The movie S1 shows both the presence of water droplets in the oil one, and their Marangoni recirculation due to 1octanol evaporation.