Amazon's indoor rainforest-like office space opened today after being in development for seven years. CNBC reports of what can be found inside the Spheres: The Spheres' three glass domes house some 40,000 plants of 400 species. Amazon, famous for its demanding work culture, hopes the Spheres' lush environs will let employees reflect and have chance encounters, spawning new products or plans. The space is more like a greenhouse than a typical office. Instead of enclosed conference rooms or desks, there are walkways and unconventional meeting spaces with chairs. Amazon has invested $3.7 billion on buildings and infrastructure in Seattle from 2010 to summer 2017, a figure that has public officials competing for its "HQ2" salivating. Amazon has said it expects to invest more than $5 billion in construction of HQ2 and to create as many as 50,000 jobs. The Spheres, designed by architecture firm NBBJ, will become part of Amazon's guided campus tours. Members of the public can also visit an exhibit at the Spheres by appointment starting Tuesday.