Invisible speakers ?

[Touti]

http://www.emolabs.com/emoproducts/index.html

Edge Motion™ speaker systems represent a breakthrough in audio technology that delivers unparalleled audio performance from a "zero footprint" package.  With the unique ability to create a fully-transparent speaker that offers amazing sonic performance, Emo Labs has developed Edge Motion™ audio systems for display-based applications. 

[Dragonfire]

That's different.  I haven't seen anything like that before.

[Najemikon]

I've heard of similar down the years; speakers as picture frames, or even a very small suction device for your window that could use the glass for excellent reproduction. For my money though you can't beat a proper cabinet.

[Touti]

Mark my words, there will come a time when we're gonna go to our local paint stores to buy a gallon of 5.1 paint

[Najemikon]

    Some years ago I heard the Japanese had perfected a Tv you bought in a roll like wallpaper and you could literally cut it to size! Cheap, too. Probably why it hasn't been seen since...