Wearable gestural interface

Apparatus comprising:

• (a) a camera;
• (b) a projector for projecting images on a surface, which surface is separate from the apparatus and is not dedicated to electronic visual display;
• (c) a transceiver for connecting to a global network;
• and
• (d) a digital computer for
• (i) performing analysis of visual data captured by the camera (A) to identify a solid object or a feature of the solid object, neither the object nor the feature being an image projected by the projector, and (B) to recognize a gesture made by a human in the air while the human is neither in physical contact with, nor holding an object that is in physical contact with, a solid surface, and
• (ii) based at least in part on the analysis:
• outputting instructions to obtain, from the global network, information about the object or feature;
• receiving and processing data indicative of the information, and
• outputting instructions to make changes to the images, in a way that the changes depend at least in part on the information and the gesture;
• wherein
• (A) the global network comprises the Internet, the World-Wide Web, or any other global system of interconnected computer networks, and
• (B) the apparatus is wearable in a manner in which weight of the apparatus is not supported by a human user's hands.