Seth Weintraub, a blogger for 9 to 5 Google, who first wrote about the glasses project in December, and then discovered more information about them this month, also said the glasses would be Android-based and cited a source that described their look as that of a pair of Oakley Thumps.

They will also have a unique navigation system. “The navigation system currently used is a head tilting to scroll and click,” Mr. Weintraub wrote this month. “We are told it is very quick to learn and once the user is adept at navigation, it becomes second nature and almost indistinguishable to outside users.”

The glasses will have a low-resolution built-in camera that will be able to monitor the world in real time and overlay information about locations, surrounding buildings and friends who might be nearby, according to the Google employees. The glasses are not designed to be worn constantly — although Google expects some of the nerdiest users will wear them a lot — but will be more like smartphones, used when needed.

About time. Now where's my flying car?