They look like crash landed UFOs but these 3.4 ton disks are actually robotic water cleaning devices.
The robot cleaners are fully solar powered and cool themselves down during the day by squirting water up from the moat and splashing themselves. During the night their surface is covered with LEDs that flash on and off.
One disk has been deployed in the moat of Osaka Castle and the other for Osaka’s Dontoburi canal. Sadly, the alien cleaners aren’t commercially available as they’re not cost effective. They’ve been bought to run along with the 2009 Osaka Aqua Metropolis festival.
In Pure Spirit
What do you think? Would you like to see large disks like this floating along the waterways in the United Kingdom or do you think they’re odd, expensive, out of place and we should have better methods of keeping our water clean?