A new kind of tennis has been served online.
Called Photoshop tennis the players are graphic designers, the balls are images, and the racquets are stored in your computer.
Photoshop is the standard graphic design programme for computer artists worldwide.
It works by using a system of layers - background, foreground, with multiple slices in between, each forming an element of the image.
International rally
To start a match one player e-mails a Photoshop image to the other containing a single layer.
The opponent takes this image, adds a new layer to create a whole new picture and returns it to their opponent.
In this way, the Tower of London can be transported to New Delhi then given a purple paint job.
This rally carries on with each player adding new layers, evolving the images until the match ends.
This is decided either by a time limit, a forfeit or mutual consent.
The matches are played live online at coudal.com, where the spectators can add comments in real time, and then vote for a winner.
Showing off
Photoshop tennis is more than just an interesting visual exercise.
It's a place to show off your design skills and display your wares in a competitive job market.
And because it uses images, not words, people from all over the world can join in whatever language they speak.
A typical Photoshop tennis match
It is broadcast on BBC World Service radio on: