light magic

saw the most fascinating thing over ibc today - photocatalyst technology in japan. if i remember it right, titanium oxide is used to coat the surface of ceramic tile or glass. once light touches the surface, any trace of dirt is wiped clean... now that's what i call a NEAT technology! some buildings are coated with the solution and every morning, upon the rising of the sun, presto! spic and span! even annoying traces of water droplets become invisible after a rain... ang shoray!