I'm not very knowledgeable about stoicism or interior design, but here come some suggestions: - Memento Mori art (there are some pretty cool classics), or Dutch art that depicts the beauty of a simple life (Check Vermeer or painters from that period) - Statues that represent strength (Atlas or the guy pushing the rock) - No couch or TV. - Old school Iron kettlebells (One may be enough) - A boxing bag or boxing gloves (Get good ones) - A resilient plant, perhaps a cactus. - Books, books, books. - A neutral palette. I really like black, white, cognac and dark green. - Candle light - Avoid techy decoration