Cristo’s work can be characterized by an emphasis on the color black and distinctive graphics, such as the repeated use of "XII" in his work. XII represents the number 12. The artist conceptualizes the idea of the color black being represented in our galaxy and the number 12 as the number of times. For example, there are twelve months in a year, twelve astrological signs, twelve hours in a day. According to numerology 12 is the number of creative and individualistic self-expression.