I notice the scents first like the aromas of incense, scented candles, and the lingering traces of perfume or shampoo in bathrooms and bedrooms. Clutter is always good too because it gives the place a lived in feel and not some sterile or generic straight out of the catalogue look.

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Deep into that darkness peering,
long I stood there, wondering, fearing,
Doubting, dreaming dreams
no mortal ever dreamed before.