Our head maybe small, but like the sky that filled with billion of stars, it contains billions of sweet and sad memories; and we actively add more and more memories to our head from time to time. Like newspaper our head treats the memories in a discriminate way based their importance. Some memories serve as headline, displayed in capital letters, bigger and bold fonts, making an everlasting impression in our life. Some memories filled the back pages with small prints, leaving no significant trace in our mind.
With billions of memories (and constantly increased moment by moment) in our head storage system, it is fortunate for us that we have a gift of oblivion. We forget some of the memories indiscriminately especially those who on the back pages. But some memories especially those on the headline are immune to the power of oblivion. Unfortunately we can not control this system of oblivion, we can not choose which memories we want to forget, which ones that we want to keep. Sometimes we have some memories that we want so bad to get rid of from our head inventory but they stubbornly linger there mocking at our futile effort to flush them away.