'Ecce Puer' (Behold the Boy!) is a portrait of Alfred William Mond, produced after a commission from the boy's father, Emil. Legend has it that Rosso experienced great difficulty with the work. Then, one evening, he was struck by the appearance of the boy as he peered through some curtains. Rosso chose to depict that fleeting moment and apparently finished the bust in a single sitting. When it was first exhibited in Paris in 1906, the sculpture was entitled 'Impression of a Child'.