Back in the day, computer monitors were big and heavy and expensive.

And if you left them on all night with your word processing screen open,

you would burn in the phosphors, and pretty soon your monitor would be useless.

Then in 1989, Berkeley Software introduced after dark, which turned your screen, if you had a Mac,

into a series of flying toasters, winged flying toasters that would dance up and down back and forth across your black screen.

Hey, it's Seth and this is a Kimbo.

We'll be back in a second, after this message from our sponsor.

Some people are better at changing the culture than others.

Hey, it's Seth, and I'm here to talk to you about what it means to bring intent, to bring care and effort to changing things, to do work that matters for people who care.

I call that marketing, and I'd like to invite you to check out the marketing

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there come make a ruckus. Flying toasters is a piece of software. Flying Toasters screen savers is a choice.

You can either buy it or not buy it. It was a hack to the operating system.

It allowed a software company to go into your computer and make it better

if that's what you wanted. We have countless pieces of software on our operating systems.

And if you buy a piece of software that runs in Windows,

it's probably not going to easily run on your Mac

and vice versa.

The operating system is a series of rules, approaches, ways that software can work.

And if you're going to create an operating system, you have a lot of responsibility.

If you are living inside an operating system working with one,

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