Happiness in small things

Why we search big things in life to feel happy and enjoy? We wait for some miracle or big money to fall into our lap and then we will buy happiness from the market and feel contented. But next day again we search happiness. Why our happiness doesn't stay longer. I think in search of big things we ignore small things in our life. Just imagine if it is raining outside and you are alone in the house. Just create a small kid in you and start jumping or let some showers fall on your head. you will feel great happiness in doing so. Is small happinings really small than Big happinings?