An ambigram is a word or phrase which looks the same when viewed standing on one’s head.
Currently, many scrolling mechanical street adverts allow the internal, looped sheet bearing the ads to be inspected through a glass pane on only one side of the case.
Today’s invention is to create ads on the rotating sheet which consist of ambigrams, so that these may be seen equally easily through either side of the case -thus doubling the available area of advertising.
