If you're a typical single guy, it stands to reason you've got a little cleaning to do. Espesially when the parental unit or a potential mate is coming over. Aside from rounding up all the old pizza boxes and socks, there's still a lot of debris (gum wrappers, cigarette packs, junk mail, etc.) to get
cleaned off the floor.
With louvered floors, you could flip them at 90 degrees and let all the crap just fall through. No sweeping or vacuuming.
Or if you've got carpeted floors and are about to have a party, no need risking wine stains. Just flip the louvered floor and hey, presto! hardwood floors. (Also great for recording studios.)
You could even use the triangular louvers (like triview billboards) to have a choice of three distinct floorings, or a combination of the differnt styles.
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For cleaning, the debris would just fall through. There's a multitude of ways to deal with this, one of my favourites being a huge tray that slides out of the side of your house, like the tray under your fridge or puppy cage. Or a funnel. Or a large conveyor belt. Or nothing, just let it fall through to the dirt under the house.
As for furniture, only flip half the louvers at a time, slide the couch and flip the other half. Or you could just flip the dirty portions of the floor.
The weight capacity is managable through corrogation and intermitant supports. (Supports would probably be patterned somewhat like the "square wheel" roadway <http://www.sciencenews.org/articles/20040403/mathtrek.asp>) I'm thinking the triangular louvers would be the best solution here.
But after reflection, the interior design aspect might be the selling point. The cost would be high, so it'd have to be marketed to people looking to spend a lot on their home, not so much single guys with messy houses.
Imagine being able to alter swaths of the living room floor to coincide with the event you're hosting: shag carpet for intimate settings, low carpet for day-to-day, and hardwood for parties.