Fig. 1.
Virtual content (block) is added to the real world (table). A hardware device (tablet) including software is used to make the content visible for the user
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.