So I want to do this:
1. Add an image to any page;
2. make some background magic;
3. when image is clicked, there is a full-screen popup with few more images which I define.
Adding WP default gallery is not an option, because it displays all images though providing fullscreen sliding between them, but I need it launched from one (only!) image.
Googling didn’t help me, all I find is slideshows or gallery plugins, which are great, but not for my purpose.