It takes practice. My elementary school had these on the bookshelves we used for indoor recess, so I spent several hours just staring and staring, hoping for something to happen. Eventually due to the boredom of the staring, my eyes defocused naturally and I saw enough of an effect to realize that was the whole trick. Then from there I tried to gain conscious control of my focus depth while adjusting the viewing distance, until finally I fully got it :)
I had to go get urgent care wax removal after a wax hunk shifted and plugged up my ear painfully. I was at college and had my parents' crappy insurance. I got billed $350. I bought several irrigation devices and an endoscope that plugs into my phone after that. NEVER AGAIN >:(
Libraries tend to have bulletin boards filled with upcoming community events. Plus then you're already at the library so you can grab a book or a movie or something too
Where!? Point me in the direction of these people so I can uh... show them the error of their ways! But first I will have to gain their trust by joining, of course.
addendum: made a list of my existing surrealtube faves
Sam Barnett
The Diary of Tortov Roddle by JollyRoger
Hot Regards
Museum of Obsolete Objects
PES
xyoureyes
Symmetric Vision
Don't Hug Me .I'm Scared
Duncan Hatch
Honibloom Dreams by Jeremiah Content
The Shore by Eron Sheean
Sit Down, Don't Touch Anything by Frederic Siegel
Acid Rain by Tomek Popakul
A Lost Little Puppet by Sans Strings Studio
Ghosts Before Breakfast (soundtrack added because original was lost) by Hans Richter