an illusion in which the water appears to flow uphill.
http://www.bbc.co.uk/gardening/events/c ... rden.shtml
an explanation of the illusion
Derek Phillips, the Dyson engineer who spent 12 months building the feature, told BBC News Online that his head was spinning when he was given his brief.
"James came up to me and said he wanted this idea to make water go uphill. My initial reaction was to look for Paul Daniels' phone number.