It's easy, shopping online, to lose track of what a piece is actually made of. A photograph can make painted particleboard look like walnut, and a filter can make a thin metal finish look like solid brass. But materials are the first thing your hand notices even when your eye has been fooled, and they're the difference between a piece that ages gracefully and one that needs replacing in two years.
Solid wood has weight — literal weight, and the kind of visual weight that anchors a room. It has grain that varies slightly from piece to piece, because no two trees are identical, which is part of what makes it feel less manufactured than materials engineered for uniformity. It can be repaired, refinished, and passed down, which is more than can be said for most modern substitutes.
Brass and bronze earn their keep the same way. Rather than degrading, they develop a patina — a soft, warm darkening that many people spend money trying to replicate artificially. A brass candlestick bought today and used often will look better in ten years than it does now, which is a rare thing to be able to say about anything.
Glass and ceramic round things out. Good glass has a bit of heft to it; good ceramic has a glaze with real depth, not a flat printed pattern. Both catch light differently than plastic ever will, and both simply feel different in the hand.
None of this means avoiding every modern material — but it's worth knowing, piece by piece, what you're actually bringing into your home. Real materials cost more upfront and considerably less over time.