The Working People
These are like pet rocks that you take to work. Two faces per rock . !!!
When you are worn out of working, when life becomes too much for the wages you are paid, when it is not time yet to take a break for a looooong lunch...... you can put out the misery side to give people a clue as to how it might be wise to approach you.
Howver if you have just done a great deal that seals your financial future, or even just gotten all that data set out right.......put the happy side facing clients or workmates . This will let everyone know that they can come and be happy with you.