They have:
- Notes they cannot cash.
- Bars they can't lean on.
- Scales that weigh nothing.
- Flats they can't live in.
- They are not policemen, yet they have their beats.
- No matter how busy, they always have time for rest.
- They are not locksmiths, although they deal in keys.
- They are quarrelsome while living in perfect harmony.
- With all those chords, they are very good at Geometry.
- They can out-do Einstein, for they change the time!