Figure 1.
The spotted dog illusion. Just as the spotted dog is obvious to anyone who has seen it, and is often invisible to someone who hasn't, use of an interface can be obvious to the engineer who designed it and opaque to a new 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.