this is the dyson air multiplier, which is like an electric fan with no blades. using it's air multiplier technology, it draws in air and amplifies it 15 times! with no blades or grille, it means that is is much safer, much more efficient, and much easier to clean too. How does it work then? Click on the below image for a more detailed explanation.
James Dyson (above) says:
I’ve always been disappointed by fans. Their spinning blades chop up the airflow, causing annoying buffeting. They’re hard to clean. And children always want to poke their fingers through the grille. So we’ve developed a new type of fan that doesn’t use blades.
The conventional fan relying on blades has been largely unchanged for about two centuries; the first mechanical fans are said to have been built in the Middle East in the early 19th century. Ceiling fans blew onto the scene in the 1860s, powered by running water and a setup that turned a series of belts with the ability to operate several fans at once (some of these still exist in old buildings). A personal electric fan hit the market in the 1880s.
if you follow the link to the dyson page at the bottom, there are loads of videos explaining the whys and hows of the idea, which are well worth watching. another genius bit of product design from dyson!
link to dyson