Described is a technology by which a communications identifier such as a telephone number is used in selecting relevant content for outputting as audible andor visible information to a destination device. The method also includes providing a carrier gas and a carbon source and exposing at least a portion of the substrate to the carrier gas and the carbon source. Methods of building a structure with the wall elements are also disclosed. Adjacent emission regions have alternating pole orientations such that each emission source having the first polarity is between two emission sources having the second polarity and each emission source having the second polarity is between two emission sources having the first polarity.