The future is in more than two dimensions. Photographer: Chris Ratcliffe/Bloomberg
The future is in more than two dimensions. Photographer: Chris Ratcliffe/Bloomberg

Admit it. Back in 1984, you chuckled when you saw the advertisement for the Apple Macintosh 128k computer. Who would blow $2,500 on a beige plastic box with a keyboard? What on earth would anyone do with a personal computer anyway?

Fast forward to today. You've read about 3-D printers. You know they're all the rage with the geek squad. You may even have seen today's news that Home Depot Inc., the world's biggest home-improvement chain, plans to start selling them. You're not entirely sure what you'd do with one. But can you risk getting left behind -- again?

So the Trade of the Day is to buy a 3-D printer -- using some of the cash left over now that computers are so darned cheap.

To contact the author of this article: Mark Gilbert at magilbert@bloomberg.net.

To contact the editor of this article: James Greiff at jgreiff@bloomberg.net