Lesage was born into a family of miners and was sent to work in a coal mine from an early age. In 1911, when he was 35 years old, Lesage claimed he heard a voice speak to him from the darkness of the mine and tell him, “One day you will be a painter”. The only contact Lesage had had with the arts at that point in his life was a visit to the Palais des Beaux-Arts de Lille museum in Lille during his military service. The voice experience prompted him to explore communication with what he believed was the spirit world, and within a year of his first experience, Lesage was hearing more voices, this time specifically giving him instructions. The voice told him what to paint, what art supplies to buy and where to find them. It was his belief that the voice speaking to him was the spirit of his little sister who had died at the age of three.