The most original drawings RAP (Robotic Action Painter), created in 2006 for the Museum of Natural History in New York, creates drawings and paintings based on emergence and stigmergy. Additionally it is able to determine, by its own means, the moment in which the painting is finished. RAP's decision is taken based on the information that it gathers directly from the painting, what produces a considerable variation of time and form, since RAP can decide that the work is complete after a relatively short while (entailing accordingly a low pictorial expression) or can extend the picture construction for a quite long period, making it much more dense and complex. The "secret" of this behavior is in its nine color sensors allowing the reading of local patterns, in addition to color spots. RAP is also my first robot to sign its works. The show exhibits the first 12 drawings done by RAP in New York in 2007.