I have seen beautiful altars that nobody visits. They were built the way people decorate for guests: impressive, complete, and cold. An altar is not a display. It is a standing appointment between you and the unseen, and like any appointment, you will only keep it if some part of you wants to go.
Start with the surface, not the symbols
Choose a surface you already pass every day. A shelf at eye height. The top of a dresser you open each morning. The corner of a desk. Hidden altars in closets sound romantic and go quiet within a month. The unseen does not mind being seen.
Clear it completely. Wipe it down slowly, and mean it. This is the first working you will do on it, and the altar will remember.
Three things before ten
You need less than you think: cloth, flame, and one true object.
The cloth sets the temperature of the whole room. Velvet drinks the light and gives it back slowly, which is why it has dressed altars for centuries. Deep colors hold candlelight best.
The flame is the appointment itself. One candle, lit with attention, is worth forty crystals arranged for a photograph. When the candle is lit, the altar is open. When you pinch it out, the altar is closed. That simple hinge builds more practice than any elaborate rite.
The one true object is whatever actually means something to you. A stone from a walk that changed your mind. A card pulled on a day you will not forget. Your grandmother's thimble. Meaning cannot be purchased and placed; it can only be recognized and honored. Tools can come later, and when they do, choose slowly: a scrying mirror or a good deck earns its place, one at a time.
Tend it like a relationship
Dust it before it needs dusting. Change the water before it clouds. Let things leave the altar when their season ends. An altar that never changes is a museum, and the unseen does not linger in museums.
Then give it one minute a day. Light the candle, put your hand flat on the cloth, and say one true sentence. That is the entire practice. The elaborate evenings will come on their own, the way long conversations come easily in a friendship that is kept warm.
If you want to build the interior version of this room, the one you carry with you, that is the work of The Temple of Remembrance. The outer altar and the inner temple are the same practice wearing two dresses.
Ruby Starr writes the hearth column of the Journal: the sensory, daily side of the practice, where the Craft lives between candle and cloth.