Can you find the circles?

[GK4Herd]

There's 16 circles in this picture. It took a hint for me to find them. I'll hold off on the hint for a while.

 

[i am herdman]

Got em. Now I am dizzy.

 

[GK4Herd]

Once I knew where to look it was easy.

 

[WV-FAN]

had to cross my eyes, but eventually they stood completely out. kinda neat.

 

[ohio herd]

easy.... helps I had seen this one before!

 

[C.K. Ocsevol-Evad]

Took me about 10 seconds. The inclusion that there were 16 of them gave it away. With 20 squares, I knew it had to somehow be related.

 

[GreenDuke]

Took me 8 seconds.

 

[GK4Herd]

Green Duke must be smarter than rifle. Me? I rode the short bus to school today I guess.

 

[GreenDuke]

Green Duke must be smarter than rifle. Me? I rode the short bus to school today I guess.

Nah, no way.

 

[big_country90]

Got it in 7.238 seconds.

 

[i am herdman]

Green Duke must be smarter than rifle. Me? I rode the short bus to school today I guess.

That is not possible. Just ask rifle.