Amazon opened a rainforest-like office space in Seattle that it hopes will spark new ideas for employees. Company office towers and high-end eateries have taken the place of warehouses and parking lots in Seattle’s South Lake Union district. The Spheres complex, officially open to workers on Tuesday, is the pinnacle of a decade of development here. 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.