This is an art museum in Houston designed by Renzo Piano called the Menil Collection. One particularly cool detail there is the floor registers that are turned into an artistic accent. Long straight lines with smaller lines within in the long straight hallway….nicely contrasting with the accentuated wavy wood grain. It is also nice to have such an even distribution, rather than small holes in one corner of each room.
Rem Koolhas’s team also likes to carefully consider their HVAC details. This elegant supply register is in the Seattle Central Library….scattered throughout the lobby punctuating the varied pallet of flooring materials.
deedsdesign 
The long floor register is attractive. Perhaps a similar application could be applied to air conditioning ceiling vents at the top olevel of a building for more even distribution?
Is that Ralph sitting on the big black cushion?
Yes. It is Dad, Dagmar, and Lara
A good article about HVAC design ideas.