Characteristics of Worldplay

Worldplay appeared to be a solitary, or perhaps intimately shared, pastime. Over the years nearly everyone in my extended family heard or saw something of Kar, yet immersion in that make-believe remained a solo pursuit for Meredith. Thomas Malkin, Hartley Coleridge, Barbara FoUett, and Stanislaw Lem also played alone. Friedrich Nietzsche played in the imaginary world of King Squirrel with his sister; C. S. Lewis played in Boxen with his brother. Worldplay looked to be constructive, that is ...

 Stephen Chu's Pendulum High School Experiment

For the better part of my last semester at Garden City High, I constructed a physical pendulum and used it to make a 'precision' measurement of gravity. The years of experience building things taught me skills that were directly applicable to the construction of the pendulum. Twenty-five years later, I was to develop a refined version of this measurement using laser-cooled atoms in an atomic fountain interferometer.