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"I love that computer science has made mathematics into something like an experimental science. I was never all that good at proving things, but I love doing computer experiments."
- Rudy Rucker

Directional Ticket  
  A ticket that also has the property of glowing while you are going toward what you bought.  

Here's another handy device, one that could be implemented in real life in a variety of ways. For example, how about a theater ticket that actually helped you find your seat. It could be implemented with a system of scanners, with an embedded RFID tag in the ticket itself. Ushers - enjoy your sinecures while you can! The fact that they are lighted would be of help also.

"Where do I go?"

"Follow the light. The ticket will keep glowing as long as you're pointed in the right direction."

From Foundation, by Isaac Asimov.
Published by Doubleday in 1951
Additional resources -

Another example of a device that gives you valuable feedback is a battery that has a test strip built-in. I don't know how cheap the test strip has to be before it makes sense to put one on every battery, but I'll bet theater tickets are expensive enough provide the necessary margin. Maybe the ticket itself doesn't light up, but when you pass through a set of gates, a sensor in the gate tells you if you are going in the right direction.

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Additional resources:
  More Ideas and Technology from Foundation
  More Ideas and Technology by Isaac Asimov
  Tech news articles related to Foundation
  Tech news articles related to works by Isaac Asimov

Directional Ticket-related news articles:
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  - Talking Lights Help Patients Navigate
  - Ticketime Concept Timepiece Ticket
  - Haptic Gloves Teach Braille Without Effort
  - Touch Typing Taught Haptically DIY-style

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