Wall

Yes, the cell membrane is what keeps the inside in and the outside out, and decides what can go in or out. The cell wall is for strength, but lots of organisms don't have a cell wall. The bacterial cell wall is what is attacked by penicillin. source

What you have described sounds really busy to me. Within one room I would keep the patterns matched to each other, not introduce another pattern on one of the walls. source

Any kind of wall is fine, as long as it has studs in it. You don't hang the mount directly from the sheetrock - you anchor it in the wooden studs that form the structure of the wall. Invest in a stud finder and read the directions on your wall mount thoroughly - you'll be fine. source

In walls must have a backbox in order to successfully compete with other styles of speakers. With a backbox to contain the sound, they become infinite baffle speakers. As such, there will always be some leakage of sound through the drywall. source

Generally it makes no difference whether the fence is next to the wall or on top. The rule is your fence must be max two metres measured from your land. Neighbours fence must be max two metres measured from his land. source