If someone is "see
ing the world
," it means that they always look on the bright side
of life and are generally happy
people. These are your friendly
y folks that sometimes you just can't not like. They seem to radiate
at all times.
The etymology of the phrase is somewhat strange. During the mid-1800's, glasses with colored lenses were used to treat various diseases and illnesses. For example, blue lens were for insanity, yellow ones were for treating syphilis, and pink was used to cure depression. Supposedly, looking through the pink lenses made you happier. I believe it. Damn, if someone gave me rose-tinted glasses when I was feeling sad, I'd cheer right up. But I'm weird like that.