Why Do Children Hide by Covering their Eyes?

Some psychologists tried a bunch of experiments designed to elucidate the logic young children use when they try to hide by covering their eyes. Christian Jarrett summarizes their conclusion:

The researchers wondered if their invisibility beliefs were based around the idea that there must be eye contact between two people - a meeting of gazes - for them to see each other (or at least, to see their "selves").

This idea received support in a further study in which more children were asked if they could be seen if a researcher looked directly at them whilst they (the child) averted their gaze; or, contrarily, if the researcher with gaze averted was visible whilst the child looked directly at him or her. Many of the children felt they were hidden so long as they didn't meet the gaze of the researcher; and they said the researcher was hidden if his or her gaze was averted whilst the child looked on.

"... it would seem that children apply the principle of joint attention to the self and assume that for somebody to be perceived, experience must be shared and mutually known to be shared, as it is when two pairs of eyes meet," the researchers said.