It looks to be high up as I can see lighting.
Yes, a street lamp! Well, so we know that object is in the street.Also, consider the material it is made of. What exactly? Now, think, what kinds of objects that size and of that material can be placed in streets or close to them?
a metal tube/pipe with what looks like the remains of concrete casing
Yes, but it is not a common metal and not concrete but sth nobler, namely granite. Besides, look at the site - where is it placed? A hint: the pipe has a hole but it doesn`t go through the whole pipe - it is only about 10 cm deep. Why? What is there in that shallow hole?
you take deliberately misleading photos for use in your riddles ;)
Most of the time - I don`t think about it when I take them. It only applies to about 10% of my photos.
Those images don't look as if they've been projected either.
They were sort of projected, if we use the correct word correctly., namely to visualise sth on a surface. What kind of surface?