"I believe in starting with simple shapes and clean, geometric lines. That, to me, is what timeless design is all about—classic shapes, forms, and materials. You can always embellish and add details, but it's best to start simply, as it is easier to add than to take away. And you have to be careful of the distinction between stylish design and good design. Stylish is 'of the day,' while good design truly endures."Decorate with geometrics like these 9 designer bedrooms.