In Chinese Five Elemental Theory, the Earth element is the center. It represents balance, being grounded. Its color is yellow or earth tones. Its flavor is sweet. In Feng Shui, the kitchen is best placed in the center of the home. Life is centered around this meeting place of food and family. This is Chapter 11 of the Tao Te Ching translated by Ursula Le Guin (1998):

Thirty spokes
meet in the hub.
Where the wheel isn’t
is where it’s useful.

Hollowed out,
clay makes a pot.
Where the pot’s not
is where it’s useful.

Cut doors and windows
to make a room.
Where the room isn’t,
there’s room for you.

So the profit in what is
is in the use of what isn’t.