From the Dust Jacket:

Fourth Volume
knives and Color-Blindness is not just a repertoire of sleights and routines. Above all, it encapsulates an extraordinary philosophy of magic, in which the love for detail, for naturalness and psychology alike, are given as much importance as technical skill. Ascanio's remarkable in-depth study of the psychological aspects of the "Paddle Move" and the "color change" with knives is a fundamental contribution to the magic of the color-changing knives. Arturo de Ascanio shows two specific qualities that very seldom go together: he is an extremely clear writer and also an excellent performer of sleight-of-hand. You will no doubt find that Ascanio is very good at writing about what he knows, and knows very well what he is writing about.