Happy face :) is like a concave mirror
Moodless face :| is a plane mirror
Sad face :( is a convex mirror
Convex mirror gives a wider scope of view. So, when you know too much things that aren't supposed to know, you'll feel sad. Therefore, a sad face :(
Plane mirror is like, BORING! So when you're neither sad nor happy, you're moodless. Resulting in a :| face.
Although concave mirror also magnify objects, but when is nearer to the object, it's upright, further, it's inverted. Thus, when its near, you can view things MORE clearly and it's upright(optimistic) but from far, it's inverted(pessimistic) and you can't see as clearly as near So, optimistic > pessimistic. Then you can be happy! :) :) :)
:D
consist of a plane and a concave mirror
And they both will reflect a lot
and it's something like kaleidoscope
*Imagine yourself in the kaleidoscope*
Then you'll be like WHEEEE!!!!~
Hence, :D