Optical illusion have always fascinated mankind since they were first discovered, raising important questions about the way our brain works. The following optical illusions will definitely test your imagination and observational skills to the max so test yourself to see how you perform.


Despite of many years of research the human brain still has a lot of mysteries that are yet to be uncovered. The way our brain perceives reality is a subject that was debated for a long time and the answers are still pretty vague. Although it might be tempting to believe that what we see and what our minds perceives is identical some of the following optical illusions might make us change our mind. A first example is the default picture where it might seem that there are two triangles but in fact only one triangle was drawn. This illusion is known as the Kanizsa Triangle. Here are some other intriguing optical illusions:

尽管有了多年的研究,人脑依然有很多尚未能揭示的奥秘。我们大脑感知现实的方式是一个被争论了很长时间的主题,而且答案依然是不明朗的。虽然似乎该相信我们所看到的和我们所感知的是一致的,但是下面这些视觉上的错觉可能会使我们改变自己的感知。第一个例子是默认图片里似乎有两个三角形,但实际上只画了一个三角形。这种错觉被称为卡尼莎三角形(译者注:1976年,因意大利心理学家Gaetano Kanizsa 而得名)。下面是其它一些有趣的错觉:

Fraser Spiral Illusion


This famous illusion is known as the twisted cord or false spiral illusion. The contrasts in this picture give the impression of a spiral however, this ”spiral” is actually a simple series of concentric circles that has the power to trick our brain due to the contrasts formed.

这个著名的错觉被称为扭曲的螺旋线或者虚假的螺旋幻象。这张照片的对比反差给人一种螺旋的感觉,但是实际上这个“螺旋”只是一系列的同心圆,只不过由于形成了对比反差从而能够欺骗我们的大脑。(译者注:1908年,因英国心理学家James Fraser 而得名

The moving image illusion


Sometimes the contrasting colors and the placement of a certain elements can trick our brain into thinking that some images are moving when in fact they are static. This is exactly the case with the following image.


Cafe wall


Another classical optical illusion is the cafe wall, which was first discovered by doctor Richard Gregory. In this illusion although the lines appear to be bent they are actually perfectly straight and actually parallel. Just take a closer look at the picture and you’ll immediately see this.


The Hermann Grind


This illusion first discovered in 1870 is characterized by the “ghostlike”  intermittent appearance of lightly colored gray dots that seem to connect the white surfaces and the black background. However, once we take a closer look the dots “magically” disappear. This illusion can be explained by a dissonance that takes place in the receptive field of the brain.

这个错觉是在1870年首次发现的,其特点是:“诡异的”浅灰色圆点间歇性的出现,似乎连接着白色的表面和黑色的背景。然而,一旦我们仔细点儿看,这些圆点“魔术”般地消失了。这种错觉可以解释为大脑的感官部位出现了不一致。(译者注:有两种grid illusion,下图是另一种,更详细点击此处

Pictographic ambiguity


Nowadays there are a multitude of illusions based on this concept. Photographic ambiguity tests your imagination as well as your observational skills by placing different images that can be perceived by looking from different angles. Can you spot both the young lady and the older one?


Having trouble figuring this one out? here’s a little clue to make things easier: the chin of the young lady actually forms the nose of the old lady.


If this one seemed way too obvious for you here’s something a little more challenging that will really test your observational skills. Can you find the hidden tiger in this picture?


This painting is might seem like nothing more than a wonderful landscape painting but the this apparently ordinary nature representation holds many secrets that cannot be uncovered at a superficial glance.


In fact the picture has a multitude of hidden portraits all over if you just know how to look. While most people claim that there are 13 faces some claim they have found over 21! How many can you spot?


You can find the image here.


Tip: If you need help figuring out the where the hidden tiger in the previous image is, try taking a closer look at the stripes on the back of the tiger.



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