An optical illusion isn't only a fun thing but also an opportunity to check some mental aspects and to observe yourself from a different angle. For instance, you are given a task to see a particular number of objects or mark which image you saw first.
There's a famous sketch called "My Wife and My Mother-in-Law." Its origins haven't been identified yet; however, it is approximated that it appeared in Germany at the end of the XIX century. And it was published in an American magazine in 1915.
The task was to find the portraits of a young woman and an older one. It was pretty easy, everyone managed to do that. However, some people saw the beautiful girl first and others saw the old lady. Australian researchers decided to study the responses of people from different age groups.
The results were interesting. The people polled who were under 30 years old saw a young woman, and the ones over 30 saw the "mother-in-law." The researchers have suggested that:
Own-age biases affect subconscious face perception.
Whose face did you see first? And how does it correlate with your age? We aspire to have statistics of our own, so, please, share your results.
And here's one more interesting example of an optical illusion we can offer. Have you found the cat?