I believe that memories are like little perfume bottles stored in our mind. Each having a distinct fragrance, color and effect. Even after a long time has passed, you just need the tiniest rippled to cause a flood, bringing in these distinct feelings and fragrances gushing into your mind. But these floods sometimes cause a little damage. They remind you of better times which make you nostalgic. Or the stormy days that make you wonder how you survived. Each little bottle has its own significance.