The Lord of these groups of atoms and energies is Ganesha. He is the supreme consciousness that pervades everything and brings order in this universe.
We are all familiar with the story of how Ganesha became the elephant-headed God. Parvati created a boy out of the dirt of her body and asked him to keep guard while she bathed. When Shiva returned, the boy did not recognize him and obstructed his passage. So Shiva chopped off the boy's head and entered. Parvati was aggrieved. To pacify her, Shiva instructed his helpers to get the head of a being sleeping with the head pointing to the north. The helpers got the head of an elephant, which Shiva affixed to the boy's torso and Ganesh was born. But there is a deeper meaning to all this.
Parvati is symbolic of festive energy. Her becoming dirty signifies that celebration can easily become Rajasik or feverish. Dirt is symbolic of ignorance and Shiva is symbolic of supreme knowledge. So when Ganesha obstructs the path of Shiva, this means that ignorance does not recognize knowledge. Then knowledge has to overcome ignorance. This is the symbolism behind Shiva chopping off the boy's head.
The elephant represents both knowledge and power.
The head of the elephant signifies wisdom. Elephants don't stop at obstacles. They just remove them and walk ahead. Ganesha's big belly represents generosity and total acceptance. His upraised hand depicts protection, and his lowered hand, palm facing outwards, means endless giving and an invitation to bow down symbolizing we will all dissolve into earth one day.
And why does Ganesha travel on something as small as a mouse? The mouse snips and nibbles away at the ropes that bind. The mouse is like the mantra which can cut through sheaths of ignorance, leading to the ultimate knowledge represented by Ganesha.
So, when we worship Lord Ganesha , these qualities within us are awakened.