Photographic memory means people can, usually for a short time, remember exactly and perfectly, everything they see. This memory fades with time. It can be so accurate that a person can even remember 1,000 separate random dots on a paper. This shows that our short term memory can be perfect.
Scientists now believe that most children have this ability when they are young. But we force them to concentrate too much on logic and language and mathematics and too little on imagination and other mental skills. And as a result, children lose this photographic memory.