Method and apparatus for multi-pass speech recognition. Following the injection of a -galactosidase expression vector having a K14 promoter gene, along with a Drosopholas P transposase expression helper vector, into murine skin in a liposome-mediated manner, the -galactosidase gene is expressed in the keratinocyte layer from 24 hours to 20 weeks after injection as measured by X-gal staining. The annular pistons are arranged in concentric annular piston slots. Once the user has designed the wall map by selecting the size, coverage area, and other customizable features such as titles, specialized icons, etc.