From that point on, he has worked mainly with pre-stenciled posters, citing the speedier application of the medium to walls, as well as lessened punishment should he be caught in the act. Blek's identity was revealed to French authorities in 1991 when he was arrested while stenciling a replica of Caravaggio's Madonna and Child, with the connection to Blek and his artwork being made by police. Blek is credited with being the inventor of the life-sized stencil, as well as the first to transform stencil from basic lettering into pictoral art. He also stated the influence of New York's Richard Hambilton, who painted large-scale human figures in the 1980s. Initially influenced by the early graffiti art of New York City after a visit in 1971, he chose a style which he felt better suited Paris, due to the differing architecture of the two cities.

His name originates from a childhood cartoon 'Blek le Roc', using 'rat' as an anagram for 'art'. He began his artwork in 1981, painting stencils of rats on the street walls of Paris, describing the rat as 'the only free animal in the city', and one which 'spreads the plague everywhere, just like street art'. Blek le Rat, born Xavier Prou in Boulogne-Billancourt, Paris in 1951, was one of the first graffiti artists in Paris, and the originator of stencil graffiti art.

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