Today I am smiling.

The one where there are crinkles around the corner of my mouth and when my eyes are full of happiness and joy.

Tomorrow I could be frowning.

The frown that has my lips facing downwards and there is nothing but sadness written on my face. 

Or I could be blank;

With no emotion on display.

The blank face that I put on when I do not want to give away what I am feeling. 

The facial expression that not only I, but many use.