Fast Moving Portals [DCTV 2011]
Physics? Why does physics have to make any sense in a video game? [YouTube]
Written (and possibly patented by) Stephen Granade
Music: Voyage to Pluto (JMD remix), by JMD; Summer Solace {durn}, by durn (creative commons)
Question asked by clayfoot on LiveJournal

but… but… but… the energy required to maintain the portal must be greater than the energy generated from the waterfall effect! Otherwise the universe will explode. It’s solarbonite all over again.