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.
Figure-ground ambiguities. (a) Ambiguous face–vase (31). (b) Normally, trees are seen as figure, and the space between as ground. However, when the space is attended, or when it has a meaningful shape, it also can be seen as figure. (Courier & Ives, ca. 1835).
