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Matt Weinberger/Business Insider

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In November 2016, Amazon opened “Day 1” — a 521-foot-tall skyscraper in the heart of downtown Seattle that will serve as its new base of operations.

The most well-known feature of the Day 1 tower is actually outside: A set of three gigantic, glass spheres that will be filled with greenery, including endangered species, when they are completed in 2018.

The idea is to give Amazon employees something of an oasis in the middle of the company’s famously demanding corporate culture.

The last time Business Insider swung by the Day 1 location in August 2016, the tower was receiving its finishing touches and the spheres were only half-completed.

I made a return visit in early May while in Seattle for the Microsoft Build conference. There’s been a good deal of progress and the project looks impressive. Here’s a look at the Day 1 tower and the mysterious glass biospheres that have sprouted up at its base:

This is Day 1 — Amazon’s new skyscraper headquarters, which opened in November 2016. It’s 37 stories tall. The name refers to Amazon CEO Jeff Bezos mantra that “it’s always day 1;” a reminder to never rest on your laurels.

This is Day 1 — Amazon's new skyscraper headquarters, which opened in November 2016. It's 37 stories tall. The name refers to Amazon CEO Jeff Bezos mantra that
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As you approach the Day 1 tower, you may notice a message on its side. From up close, it’s kind of hard to make out…

As you approach the Day 1 tower, you may notice a message on its side. From up close, it's kind of hard to make out...

Matt Weinberger/Business Insider

…but if you step away, you can see that it says “Hello World,” a reference to the classic example used to demonstrate new programming languages or concepts.

...but if you step away, you can see that it says

Matt Weinberger/Business Insider

The building also houses Amazon Go, the retailer’s version of a convenience store of the future. Right now, it’s only open to Amazon employees, with no timeline for opening to the public.

The building also houses Amazon Go, the retailer's version of a convenience store of the future. Right now, it's only open to Amazon employees, with no timeline for opening to the public.

Matt Weinberger/Business Insider

More on Amazon Go

What makes the store so special is that there are no cash registers or lines — it uses cutting-edge computer vision and payments technology so that you can just walk out with whatever you want.

What...