The 75mby 20madvertisement for the latest in the expanding iPod range is adorning the outside of the city's giant Debenhams department store.
Forrest Outdoor Media, the contractor which unveiled the site in Argyle Street, was borne out of a management buyout of the ex-ScoreOutdoor division of Clear Channel three years ago.
Its flagship is the City Screen digital site above Glasgow Central station.
Managing director Marc Keenan said: "Forrest is committed to raising the bar in Scotland by continuing to bring exciting, one-off, large-format opportunities such as the Debenhams banner, in addition to expanding our backlit portfolio."