Amazon’s triple-domed Spheres in downtown Seattle will be partially open to the public beginning January 30^th. The enormous glass bubbles, designed by NBBJ as part of Amazon’s sprawling urban campus, were first approved in 2013.

The glass and steel domes vary in size, with the largest bubble spanning 130 feet in diameter and topping out at 95 feet tall. All three Buckminster Fuller-emulating domes are linked, forming a biomorphic greenhouse with 65,000 square feet of workspace and conference areas for Amazon employees.

Instead of aping its namesake, the Amazon Spheres have selected plants from a wide variety of sources. The Seattle Times recently toured the Spheres, and gave a rundown of the gardens and 400 plant varieties, within.

The garden in the Seventh Avenue sphere holds New World plants mainly from Central and South America, though a 40-year-old Port Jackson fig tree, so large that it had to be craned in, is clearly the centerpiece.

An Old World garden grows inside of the Sixth Avenue sphere, where guests and employees will see plants from Africa and Southeast Asia, alongside an entrance-adjacent, 60-foot-tall living wall, and tank filled with aquatic plants and animals from the Amazon.

Amazon’s horticulturists have curated a range of plants that could survive alongside the Spheres’ human occupants comfortably. During the day, the spheres will be kept at 72 degrees and 60 percent humidity, which will drop to 55 degrees and 85 percent humidity at night. All of the plants were grown to maturation in a 40,000-square-foot greenhouse offsite and transplanted, beginning on May 1^st of last year.

Designing offices and meeting spaces alongside climate controls for hundreds of different plant species was no easy task for NBBJ. Fake logs and stumps circulate air from piping within, while the Spheres are warmed in part by excess heat generated from a data center nearby. More details on which companies will be filling the two public retail spaces at ground level are forthcoming. (This is not the first time NBBJ has ventured into novelty office design).

Members of the general public can place a reservation to visit the Spheres here, though be warned; the Seattle Times is reporting that 20,000 guests already have the tour booked solidly through April.