Whilst traversing the River Thames, via the London MillenniuM Footbridge, you will often have to dodge people, usually tourists, crouching down in the middle of the thoroughfare taking pictures of the floor.
No, they aren't floor connoisseurs, but rather people trying to take photos of miniature works of art.
Yes, really. Beneath the feet of the millions of people who cross the bridge yearly, are tiny works of art that many miss or are oblivious to.
It all began back with artist Ben Wilson who had decided that the various shapes made by discarded chewing gum would make good canvasses.
He began his artform in Muswell Hill and Trinity Buoy Wharf before extending across the London MillenniuM Footbridge and into Tate Modern.
Considering this unhygienic way of disposing of chewing gum, and its capacity to defy the natural order of decay, I am glad that someone is doing something to highlight the issue.
Obviously, with the footfall and weather these works of art are fleeting, so they are worth seeking out.
So, the next time you are walking across the London MillenniuM Footbridge, or visiting Tate Modern, keep an eye on where you are walking.
And if you are in Muswell Hill or Trinity Buoy Wharf and see any of these miniature works of art, stop and take a good look as they won't be there forever.