For more than a century it has looked down at all the comings and goings on Scotland's busiest railway station concourse.
"Meet me under the clock" has long been part of the vocabulary for courting couples, long-lost relatives or travellers looking for an easy way of locating someone in the rush.
More than 100,000 commuters use Glasgow Central Station every day - and most pass through without paying any attention to its architectural features.
They are either heading to work in the city or rushing home to places like Paisley, East Kilbride, Kilmarnock or the Clyde Coast.
Which is a pity in many ways. The station was built in the 1870s, with the concourse and booking hall completed in 1882 - the height of the fashionable Victorian era.
It is full of architectural niceties. The roof is a "ridge and furrow" design and the ornate pillars at the Gordon Street entrance are stunning.
But the clock suspended from the roof is probably the most noticeable and popular feature.
It has, over the decades, served as Glasgow's number one rendezvous point.
Nowadays it hangs above a Tie Rack outlet and it still conjures up all sorts of emotions.
One woman replied to an online blog picture of the clock to say: "My heart has soared and crashed under that clock."
She is certainly not alone.
Soldiers have waved farewell to their sweethearts as they left the station to fight in two world wars.
There have been royal visits and the annual summer departure of thousands of Glaswegians heading "Doon the Watter" on holiday.
Celebrities have passed under the clock, many making their way to the station's Grand Central Hotel.
Laurel and Hardy passed through, as did David Soul of Starsky and Hutch fame, and Brad Pitt and Angelina Jolie arrived by train in 2011.
The original four-faced clock, which was 15ft high with elegant wooden framework and a lead-sheathed cupola, was replaced in 1962 but it proved unpopular.
A replica of the original was put in place in 1992 and remains a favourite to this day.