How many black dots can you see at the same time? 
This illusion is called the Ninios Illusion
@neomorph works better at certain distances. For example at closer distances its possible to see black dots vanish at your peripheral vision as your eyes travel around the image.
@spaceotter Oh I tried downloading it and opening it in full screen against black background and it works now, really cool this was new to me. thanks for sharing.
@neomorph you're welcome 😄 🙌
@spaceotter All, after I figured out there isn't a point for every intersection, open it in fullscreen and go back a little and don't try to concentrate on anything in the image.
@alsternerd @Curator yeah. I find if you focus on a black dot towards the center its hard to see some of the dots to the left or maybe right in your peripheral vision without moving your eyes right or left.
@spaceotter eaxactly that. I always like to try and get a way around these illusions without any extra tools. e.g. opening it and looking from further away. That's fun to do. :)
@spaceotter @bandie 6 when I focus between them
@spaceotter @Bobo_PK @bandie of course :-D It is fun to focus all over and see what happens
@spaceotter I don't get it, I see 12 at the same are there more or fewer than that? I'm confused