Amazon just revealed its $4 billion 'Spheres' packed with a mini tropical forest - here's what it looks like inside

• Amazon created a green paradise in its new Spheres structure in Downtown Seattle.
• Created to be the focal point of its Seattle HQ, Amazon spent $4 billion on bringing a mini tropical forest to live.

Amazon is showing off its green thumb.

The company just took the wraps off its newest downtown Seattle structure. Called The Spheres because of its bulbous shape, Amazon collected plants from greenhouses around the world to take home to Seattle.

Rivers, waterfalls, and towering green walls and meant to take employees into a headspace as serene as the tropical forest the foliage tries to replicate. Workers cluster in "treehouses" to work and collaborate, surrounded by natural beauty.

The Spheres can hold about 800 working Amazonians, who seem to be excited about the new building - its available slots are already booked through April.

Here's what it's like inside the verdant structure.