A great way to train your attention and focus is by solving puzzles and riddles. Even our distant ancestors knew it — some of the earliest known riddles date back to Babylonian times.

So if you want to put your ability to notice small details to the test, you’ve come to the right place. Here is a riddle for your eyes. It is not common to have keen observation skills!

Many of us want to master this skill, but we really don’t know. We even had to look for our house keys or pens everywhere, only to find them in our hands or pockets, completely ignored.