Sad or Glad

When I'm sad,
They say I'm blue.
But my eyes,
My eyes, 
Have other ideas;
They see clear blue skies
Shiny blue lakes
Little boys dress in blue.
My eyes are glad
With the sight of blue
That makes me glad too.

Blue is gladness
It's not sadness
So ask me
When I'm blue,
Am I sad
Or glad?