So, a while back i came across a post on Facebook from the page -Mind Blowing Facts-. Luciddreaming.jpg
This was the post, and i thought i'd ask of your opinions on this technique, and maybe why this tecchnique may/ may not work. I have tried it twice now (Not including the times i tried it a long time ago), but i haven't been able to do it. Are there more than one ways of doing this technique?

I do not naturally go into sp, so i don't know if i will ever be able to, but i won't let that discourage me!
(Click on the Photo to make it bigger.)

Appreciate the help guys. Good luck to all of you