Using htaccess, how to restrict seeing directory contents, but allow server to use the contents?

Question

More specifically, I have an htaccess file that restricts anyone from seeing the directory contents. Such that, nobody can see my 1000s of images in www.example.com/images by us

Answer 1

I use a trick which makes people think they've accessed a folder which doesn't exist.

Create a HTML file and add this:

Not Found
The requested URL was not found on this server.
Additionally, a 404 Not Found
error was encountered while trying to use an ErrorDocument to handle the request.