Coming Monday
In recent months, several services have sprung up to allow a communion of the real world with the Internet, with cell phones acting as the medium.
If you send a text message to an e-mail address scrawled in paint on a subway advertisement or on a sidewalk, for example, you could get some digital pop art on your phone in return.
An adhesive arrow on a telephone poll could hold the key to the history of a nearby building.
Read more about such services in Technology Monday.