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"The writing is clicking away in my head and piling up, and unless I get it on paper somehow it's going to create uncomfortable pressure in my skull."
- Isaac Asimov

Pocket-Sized Ad-Blocker  
  A device that prevented targeted advertisements from reaching you.  

Depahli De walked through the mall, and was immediately targeted by mobile advertisements that used recognition technology to see her as young, female and upper-class.

Like transparent balloons, automated ads drifted through the multiple converging halls of the mall, rising and falling from floor to floor as easily as they negotiated side passages and entryways...

Employing aerogel cameras, adverts designed to appeal specifically to the young, female and middle-to-upper class zeroed in on her repeatedly. The constant battle between manufacturers of pocket-sized ad-blockers and the designers of mobile advertisements had spurred technological leaps among both. Depahli rarely used the blocker that Taneer had bought for her. Truth be told, she enjoyed enough of the ads to allow them access...

From Sagramanda, by Alan Dean Foster.
Published by Pyr in 2006
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