Vitsoe 620 Chair Program by Dieter Rams

They've been on the market since 1962, but the Vitsoe 620 Chair Program by Dieter Rams ($3,350 and up) is hardly the same product you could buy over 50 years ago. Completely re-engineered — with help from Rams himself — the chair is both elegant and comfortable, and like most Rams designs, a little bit clever. Thanks to its unique design, both the standard and high-back versions can be purchased as a single chair, and then expanded out to become two-, three-, four-, or even many-seat sofas in the future. The best part is that thanks to the superior craftsmanship, you'll have decades to work on building your dream sofa out.