I like them, thanks for posting them.
I play with gouache paint as often as I can to color my architectural hand renderings and site plans.
Back on topic; the physics is against us.
Naturally radiating sound (180 radiation) in a small room makes one aware of the room.
Artificially narrow beaming of sound makes the room go away but is unnatural.
An over simplification, but that's the general idea of our dilemma- yes?