Listening to the song “Águas de Março” (by Elis Regina and Tom Jobim) which talks about autumn rains, we thought about how surfaces can change in the rain: the ground deforms with the pattering of the water drops and changes its texture; what was previously opaque slowly becomes shiny and reflective. In particular, just when it starts to rain, the first drops of water draw a very beautiful graphic pattern, which however is destined to last only a few seconds.