An optical illusion shared on Facebook challenged viewers to count hidden faces in a black-and-white silhouette.

An optical illusion featuring a sneakily hidden ... While a final user said: "It’s in the negative space between the arm and ...

That’s why optical illusions are so sneaky—and so ... This puzzle relies on a clever interplay of negative space and Gestalt psychology—your brain’s instinct to group elements and ignore ...

their proximity is an illusion. Like all the best optical illusions, it's a bit of a head-scratcher. Credit: NASA And it turns out the image represents two decades of space observation.

In our today's optical illusion, we bring you a tricky ... a new perspective can help uncover the hidden character. Focus on the negative space: Rather than looking at the numbers, try to focus ...