Architect and designer Marko Coetzee once told me;
“Often the impetus to introduce new solutions comes out of a mistake made somewhere, which leads me to a new way of looking at things. My frustration with any and all design aids that are run through a computerized system is that this intuitive process of floundering about cannot be taken advantage of for its creative finds. The problem is that something is hardly ever designed until it is built.” 
There are obviously errors in any production process. There are ‘thermal errors’ , ‘alignment errors’ , tooling errors, and ‘machine breakdowns’ . There are even errors in the controllers – human and computerized. However, the most interesting errors happen when materials do not conform as intended. Sometimes stone chips, ice cracks, wood burns, and so on. It is within these material interactions during machine production error that there is potential for creative expansion. We must simply expect these interactions and build mechanisms capable of allowing us to take advantage of the material changes, instead of discarding the non-conforming materials. ‘Art-Bot’ is designed to allow the artist to react to any material unexpected material results and is capable of responding to live. This allows the artist the flexibility of working more dynamically with unexpected material reactions and thus performing a more natural enactment of the sculpted object. Marko Coetzee, “Marko on design. An interview by Morgan Rauscher,” May-2013.  M. Weck, P. McKeown, R. Bonse, and U. Herbst, “Reduction and Compensation of Thermal Errors in Machine Tools,” CIRP Ann. – Manuf. Technol., vol. 44, no. 2, pp. 589–598, 1995.  D. L. Leete, “Automatic compensation of alignment errors in machine tools,” Int. J. Mach. Tool Des. Res., vol. 1, no. 4, pp. 293–324, Dec. 1961.  H. Groenevelt, L. Pintelon, and A. Seidmann, “Production Lot Sizing with Machine Breakdowns,” Manag. Sci., vol. 38, no. 1, pp. 104–123, Jan. 1992.