Known for his interesting mix of elegant and modern styles that he masterfully assembles to create timeless spaces, Alex Papachristidis has evolved his decorating over the past decade, with the incorporation of more artisanal furniture and artwork. This beautifully photographed book profiles a wide array of arresting projects, including a luxe, modern beach house decorated in gold, silver, and white; a Manhattan home that has a vivid lavender-and-blue palette; and a colorful “bohemian”…