Answer:
Statues that exist independent of any architectural frame or setting and that viewers can walk around are called Free-standing Sculptures. In Relief Sculptures, the subjects project from the background but remain part of it.
Step-by-step explanation:
Free-standing sculptures are those "full" sculptures which can be observed at 360°, all around. A very famous example could be Michelangelo's David.
Relief sculptures are the ones that emerge, more (high relief) or less (low relief), from a background, but the observer can only see up to 3/4 of the image.