How To:
Step 1: Sit or stand in front of a wall without any visual distractions on it. Hold one hand 15–20cm in front of your nose, the other twice that far, index fingers pointed up, other fingers curled down.

Step 2: How many index fingers do you see? Really there are only 2 fingers, but how many do you see?
Step 3: If you see 3 fingers, are the 2 that are side-by-side on the hand closer to your nose or further from your nose? Whatever the case, switch so that the double-finger is on the other hand.
Step 4: Keep switching, so that you see 2 index fingers on the hand closer your nose, then further, then closer, and so on.
Step 5: Should you drift into seeing any other
number of index fingers, relax into seeing 3.
Step 6: Remember to breathe, relaxing to switch rather than straining.
Variation—The 4-Finger Game: The 3-Finger Game can also be done with an additional point in the distance—a pine tree, telephone pole, church steeple, etc.—switching focus from the near finger to the further finger and then the far-off object. In focusing on this far-off object, how many index fingers do you see?
What's Going On:



Note: These drawings are exaggerated for illustrative purposes—the doubled fingers won't likely appear to be this far apart.
More info:
• Dr. Marc Grossman loves using these kinds of eye-brain tricks to help people see. He's collaborated with artists on some "Magic Eye" books, saying that they're good for the vision—the eyes and he brain working together.
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