experience of discovering a second image within the first.
There is also no need to turn the challenge into a competition. One viewer might recognize the face almost immediately because the first place they happen to look contains an important clue. Another might spend several minutes concentrating on the deer before exploring the rest of the picture. Chance can therefore influence how quickly recognition occurs.
Giving people unlimited time can make the activity more relaxed and enjoyable. Instead of racing against a timer, viewers can experiment with different strategies. They
