Imagine that you are looking at a geometric drawing. At first, one shape in this drawing seems to be in front of other shapes. The next moment, this same shape seems to be located behind a second shape. This phenomenon is called:

an ambiguous figure-ground relationship        

Explanation:

Figure-ground relationship: In psychology, the term "figure-ground relationship" is described as one of the different principles that are being included in the Gestalt principles related to perception. It represents that an individual's perceptual system tends to separate different stimuli into either ground elements or figure elements.

However, in an ambiguous "figure-ground relationship", the relationship can be interpreted in various ways.

In the question above, the given phenomenon is called as an ambiguous "figure-ground relationship".

answer; collective security;

i heard they are taking it off i hope this isn't true but otherwise if it doesn't get taken off it will probably be in early december or early january of 2018-2019