Spatial and temporal origin of optical photons escaping the supernova ejecta at 25 days after explosion. Most of the energy comes from photons that were created only 2 days before they escape after a comparatively low number of scatterings. While only few photons escape on the same day they have been created, some of the escaping photons were created directly after the explosion and traveled for 25 days through the deeper layers of the atmosphere, suffering many scatterings.