We all like a good challenge, right? Especially when it tests our brain really sharp! This is an optical illusion that makes people scratch their heads. At first, it looked simple, but don’t be fooled. There is a big mistake hidden in a clear vision, and only the most observers can catch it for 6 seconds or less. Are you ready to check your intellect? At first, the image looked like a neat, actual card collection. The outfits are all: heart, diamond, spade and club. They seem to be arranged in a beautiful, even. Everything looks perfect or doing it?
Image credit: Mcluck
Your challenge is very simple: Can you detect an error in just 6 seconds? It sounds easy, but this is a tip, focusing more in the middle of the image. Do not rush. Let your eyes sweep slowly. You may be surprised at what you find. So what is big mistake? Warning Spoiler! If you haven’t found it and still want to try, stop reading now and give yourself a few more seconds. Is it ready for the answer? Here is: One of the cards in the middle has the wrong number. That’s right, it’s not a real trump card! 
Image credit: Mcluck
Sneaking, right? This small error was so clear that most people missed it at first. Our brain is connected to detect models quickly and when we see the familiar card layout, we tend to ignore the details. That is what makes this illusion become interesting and difficult! Optical illusions play with our brain processing visually. We often rely on shortcuts, or what experts call Muslim cognitive prejudice, to understand what we see quickly. The illusions like this also revealed how to pay attention, awareness and interactive memory. The discovery of mistakes is not only about vision but also about mental concentration.
