<The reason I performed the experiment is my dept. got a note from a nurse
who
felt use of the visual aids was deceiving to parents because her lab
experiment
conducted one slow evening at work confirmed our suspicions.

We all talked about it, she agreed, we're not using the belly balls as
measuring
devices! Just a simple visual illustration. Precision isn't a requirement.>

I agree and at this point plan to continue using the balls.  Why? Because
they're easier shapes to generalize.  I don't need a pingpong ball, I can
use a walnut or some other item people from various cultures can relate to.
I guess most people know eggs--large, medium, extra large?  Walnuts don't
come in as many sizes.  And, as you said, the precise size isn't the point;
visualization is.

Mary WD

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