periscope
An instrument commonly used to look over walls is a periscope. Periscopes are designed to allow users to see objects that are not directly in their line of sight, typically by using a system of mirrors or lenses to reflect the view. They are often used in submarines and by military personnel. Another example is a telescoping pole with a camera or mirror attached, which can also provide a view over obstacles.
The name of the physics instrument that helps us see sound waves is a oscilloscope.
To use a periscope to look over a wall, you would place the periscope on top of the wall and then look into the eyepiece at the other end. The mirrors inside the periscope will reflect the view from above the wall down to your eye, allowing you to see over the wall without exposing yourself.
to see on the other side
You go to the search bar, type in the name of your neighbor and you scroll through names to see if their name is there, click on it, then look at their information/wall*. (* you can see their wall if they didn't set their security.)
Kilroy, he was something painted on walls during World War II
The Theremin. It's an electronic instrument. See this article for more information. http://en.wikipedia.org/wiki/Theremin
guitar
Periscope.
Go and visit "THE WALL." In Washington D.C. or http://www.thewall-usa.com/ or http://thevirtualwall.org/
banjo steel guitar fiddle harmonica
'You see a person who paint wall' is not correct. There are many ways this sentence can be corrected: You see a person who paints walls. You can see a person who paints walls. You see a person who can paint walls. You see a person who can paint a wall. You can see a person painting a wall. You see a person who is painting a wall. Can you see the person painting the wall? Who is the person you see painting the wall?