While employees have embraced this urban setting, they have not given up the nature that comes with the suburbs. Studies suggest that spaces that embrace nature can inspire creativity and even improve brain function.

The Spheres is home to more than 40,000 plants from around the world, more like a tropical rainforest/botanical garden than a typical urban office. The Spheres are a result of innovative thinking about the typical workplace and an extended conversation about what is typically missing from urban offices–a direct link to nature.

“Our goal with The Spheres was to create a unique gathering place where employees could collaborate and innovate together, and where the Seattle community could gather to experience biodiversity in the center of the city,” said John Schoettler, Amazon vice president of global real estate and facilities.

Amazon is committed to sharing the beauty and biodiversity of the Spheres with the public, and provides educational opportunities to Seattle community through tours, field trips and partnerships with local schools and universities. The Spheres also include a visitor center called the Understory that is open to the public year round. The Understory provides a fully immersive experience where visitors can get up close and personal with the science, engineering and plants behind the Spheres.

The Spheres have no enclosed offices, conference spaces or desks. Still, the Spheres were built with variety of ways to communicate, work and dine on five different levels with a backdrop of river and waterfall features, a four-story living wall and epiphytic trees. Employees can meet in treehouses suspended under 40-foot trees or in sitting areas and walking paths alongside cascading waterfalls.

Beyond the nature-inspired aesthetics, the construction stats on the Spheres are staggering as well.

More than 600 full-time jobs were created through the design, build and construction of the Spheres. More than 620 tons of steel were used, enough to build the Space Needle three times. There were 12 million pounds of concrete used in the construction, or enough concrete to build a highway from Seattle to Sacramento.

The exterior facade features a naturally occurring shape in nature called a Catalan, and this shape repeats throughout the Spheres with 60 faces per sphere and 180 total. The Spheres' facade contains 2,643 panes of glass that are ultra-clear and energy efficient, with a film interlayer to keep out infrared wavelengths that produce unwanted heat.

Structural engineers tested the Spheres for all kinds of environmental factors, including 91 different scenarios. At the base of the Spheres, a 400,000-pound ring beam transfers heavy loads of gravity, wind and seismic forces from the glass-and-steel facade to columns in the parking garage below.

The largest Sphere is more than 90 feet tall and 130 feet in diameter. All three Spheres share a single indoor environment, which makes air flow critical between the buildings. Radiant floor heating and cooling is an efficient way to balance indoor temperature, and also ensures that less hot and dry air circulates through the HVAC system.

The Sphere's architect was NBBJ and the structural engineer was Magnusson Klemencic Associates.