1. A display comprising: a first image source; a second image source; a first beam splitter positioned such that a first image from said first image source is reflected by said first beam splitter and a second image from said second image source is transmitted through said first beam splitter so as to provide a third image as a composite image of said first and second images; a third image source; a second beam splitter positioned such that said third image is reflected by said second beam splitter and a fourth image from said third image source is transmitted through said second beam splitter so as to provide fifth image as a composite image of said third and fourth images.