Try to visualize that you don't "put one up" or "take one down"....or "blot one out". What really happens is you simply point at a file. The image file does not move or change by selecting the image file, you really just change a file path to point at it.
Same with all files.
When you throw a file away...you don't really move it to a trash can. There is no trash can, and you don't move the file. When you drag a file to the trash, what actually happens is you set a flag that the file is unwanted. In a physical file cabinet, if it would be like you put a sticky note on a file you no longer wanted, that says "this is trash", ignore it".
The file did not move or functionality change. It is still sitting in the same place, just flagged as trash.
When you empty the trash, the file does not move or get deleted. Another flag is set, and it makes the file invisible...and marks the space available. So at some point, when you save a new file, it will overwrite (erase) the old file that was first flagged as trash, and later marked as deleted (invisible) to use the space that the "trashed" file was occupying.
The important thing is...the file never moved.
Just like your desktop image. They don't move to and from the desktop. They are simply viewed...or not.
