..I kinda envy those who just say "Oh, I like THIS answer...I'll just believe it from now on, and avoid all that tedious thinking and juggling."

There is a cartoon strip called "Hagar the Horrible", about a silly Viking type with very modern problems. One Sunday saw him visiting the local wizard, Dr. Zook, who had a huge stone ring leaning against the wall, (like that 'money' on Yap Island).

"What's this?", asks Hagar.
"That's my new scientific measuring device." replys Dr. Zook, "Step in!"
....so Hagar squirms into the center of the stone ring....

"More...hunch down...squeeze tighter..." Zook says, as Hagar tries to cram himself into the tight space. Finally, he is in, awkwardly peering out at the pleased wizard.

"There!", says Dr. Zook with authority, "You are exactly 5 feet tall!"