autumn blue...

This morning it was sunny and the temperature was no high, the air was comfortable ... the autumn air :)
But recently I've felt that my life was dull, colourless. So I asked my friend to go shopping and eat out after work today. We strolled around in a big department store (though I couldn't find what I've wanted to buy), had nice supper in a small Korean retaurant and talked much. Still... I couldn't fully enjoy, feel a bit blue all the while. This is, maybe, because of this autumn air ???