A lot of the puzzle-solving memes you see on social media have obvious answers. This brain-twister from the past is breaking that mold. Since the 1960s, this challenge has fooled most people who gave it a shot.

In fact, only 10% of everyone who tries to figure out the answer is able to get it correct. Are you smarter than 90% of the population? Of course, you need more than just intelligence to solve this puzzle. You have to think logically. If you’re a brilliant musician or painter, you can be smart as a whip and struggle with this challenge for hours.

A logic-minded engineer, lawyer or STEM student may be able to solve it in just a few seconds. If you’ve always considered yourself a left-brained person, now is the time to prove it.

Even if you don’t get the puzzle right, don’t despair. Very few people have the right blend of intelligence and logical thinking to choose the correct answer out of the eight possible choices. Whether you get it right or wrong, you’ll want to share this clever challenge with all of your friends and family.

See who in your social network is truly logical and who has just been deceiving themselves.