On the horizon, there is a tower visible from this roof.
But you are looking at the wrong tower, currently.
There are more towers in this area.
AP: Eyesight instrument?
TLF: You know about shaped glass windows to wear on the face?
TLF: To improve eye quality.
TLF: This has similar purpose but more complicated.
TLF: It allows you to see things far away.
TLF: It amplifies their appearance.
TLF: They are not too small to see then.
AP: You mean a telescope, or something like this?