All 3 Uses

perspective
in
The Last Lecture
(Edited)

I had little interest in giving a discourse on, say, my insights into how I coped with the disease, or how it gave me new perspectives.
Part 1 *

perspectives = ways of seeing or thinking about things
I just tried to impart my perspective on life.
Part 3

perspective = way of seeing and thinking about things
And just to keep things in perspective, from the "Some-Things-Never-Change" department, an unrequited crush from high school wrote to wish me well and gently reminded me why I was way too nerdy for her back then (also letting slip that she'd gone on to marry a real doctor).
Part 5 *

perspective = a sensible view of a situation

Definitions:

(1) (perspective as in: Look at it from her perspective)
a particular way of seeing or thinking about things
(2) (perspective as in: Keep it in perspective)
a sensible view of a situation that considers its different parts in a balanced way
(3) (perspective as in: perspective in art)
giving a 2-dimensional picture a 3-dimensional appearance by making parts that are farther away look smaller than things that are close; OR a picture drawn in such a manner
(4) (perspective as in: a perspective of the entire block)
a view -- often stressing that the view is different from a view from another location
(5) (meaning too rare to warrant focus)
Less commonly, in classic literature, perspective glass or perspectives can refer to a small telescope. More specialized senses of perspective are found in geometry, sound engineering, and philosophy. Consult a comprehensive dictionary if you wish to see those. All the common senses have to do with the way something is viewed.