"Those billboards have a life of about 10 weeks and then they're useless. And finally, getting the billboards printed and framed is bloody expensive - if getting elected to council means having the biggest campaign budget then we'll be struggling."
They did not give the artists any brief. letting them paint what they wanted.
"We think they've contributed something interesting and challenging to the campaign and hopefully their work will be seen and talked about by a lot of people. We're also not adding to the visual pollution and at the end of the campaign the art can go on someone's wall and be appreciated for a long time to come."
The artworks have already garnered a fair amount of attention and Mr Keene acknowledged that they could be attractive to thieves.
"Hopefully they won't get stolen. It's public art and that usually doesn't (get stolen) so hopefully this won't. It's a risk that the artists are aware of - but it's worth taking the risk."