He would not hesitate to use his children's stencils, ink blots, puddles and stains, lace impressions, "pliage" or folding (i.e. Rorschach blots), "grattage" or rubbing, often using the charcoal from match sticks or his fingers instead of pen or brush. Sometimes he would even toss in coffee or soot to get the effects he wanted. It is reported that Hugo often drew with his left hand or without looking at the page, or during Spiritualist séances, in order to access his unconscious mind, a concept only later popularized by Sigmund Freud.