Now here's a rather natty gadget you don't see much in evidence elsewhere. In fact, it's so new that not even the best connected vandal knows what to make of it. It is, for the uninitiated, a fine graffiti like spray of highly luminescent (but otherwise invisible) ink that literally glows in the dark. Amazing, and, if we do say so ourselves, quite creatively spiffing.

To the basics, gentlemen, and it all begins with an innocent looking spray can - much like any spray can that a motor repair enthusiast or young ruffian might be familiar with. But turn the lights down and the fun begins in earnest.

On depressing the nozzle at the top of the spray can unit, an ultra-bright LED illuminates and charges a thin aerosol of invisible spray, marking white backgrounds with a highly luminous green. Continue and you'll quickly grow used to the highly novel technique of painting with light. All of which simply reeks of high tech and unputdownable fun.

But the best is yet to come. This clever device obviates the use of messy paint-like materials and instead paints with a spray that fades over time, avoiding permanent marks, and befitting it for internal use.

All of which makes us gush with excitement and dub this crafty device one of the most innovative devices we've seen in years. Now appearing on a railway bridge near you.

Go, my child, and spray like the wind.