Rephotography, or repeat photography or photographic reproduction, is the art of photographing the same area from the same viewpoint as an earlier photograph, to create a "yesterday and today" comparison. Rephotography can be very precise, triangulating to find the exact point from where the old photograph was taken, replicating the time of day and the season. But sometimes this is not possible, in which case rephotographers look for natural or man-made features present in the old and new photographs to give the audience perspective as to what has changed and what remained the same. Whether the changes are subtle or glaring, repeat photography is useful to highlight transformations in the environment, and rural and urban landscapes.