Earth
The element of the centre: the ground everything else stands on. In a room it is weight, squareness, matte surfaces, the low horizontal line of a table or a plinth.
Settling, holding
The idea
Earth occupies the centre of the Lo Shu square (the number five) and the two diagonal directions southwest (Kun, the receptive) and northeast (Gen, the mountain). It is the phase of transition between seasons, the long afternoon of late summer, and of nourishment: the field that gives and holds.
Because it is the centre, Earth is the element most concerned with the whole plan rather than any one wall. Classical siting asks whether the centre of a house is stable, open and unobstructed.
In a room
Earth is horizontal and square: a wide low table, a plinth, a bench built into a wall, a floor of terracotta or stone. Its colours are the colours of ground: sand, ochre, the warm grey of plaster. Ceramic vessels are the classical object.
A room with a strong Earth character feels settled and slow. It suits dining rooms and living rooms, and any space where people should linger. The risk is heaviness: everything at the same low height, nothing that lifts the eye.
Balance
Fire makes Earth; Earth makes Metal (ore). Wood controls Earth; Earth controls Water (the bank). When a room feels stuck, a vertical Wood element, a tall plant or a column of shelving, gets it moving again.