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Right, here is a reminder from part 1;
Now, let's juggle our ordinary three ball cascade and think about the right hand for a minute. Doing an ordinary inside throw, the right hand moves in a clockwise circle (from the juggler's point of view). It comes up on the inside of Juggle Space for the throw and goes down on the outside of Juggle Space for the catch. This is what we'll call an "Inside Exchange". In fact, whenever the right hand does a clockwise circle for the throw/catch exchange we'll call that an "Inside Exchange", even if it's not in the usual place.
The same is true for the left hand, only for the left hand the "Inside Exchange" is characterised by an anti-clockwise circle.
The "Inside Exchange" is when you do a clockwise throw/catch circle with the right hand, or an anti-clockwise throw/catch circle with the left hand.
Warning: |
This definition may seem weird if the exchange happens on the "wrong" side of the body! |
Let's do an "Inside Exchange" with the right hand, but let's do it on the left side of the body, with the arms crossed. The right hand still goes in a clockwise circle, because that's exactly what it means to say that you're doing an "Inside Exchange". Now, however, the hand is coming up on the outside, so you will notice that the path the ball will take will be the same as if it had been an outside throw with the left hand. Ignore this. We're not concerned for the moment about the actual path of the ball. We're only interested in which direction the hand goes round.
Of course, if the hand goes the other way round then we're going to call it an "Outside Exchange". This only seems fair and reasonable.
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Quotation from Tim Berners-Lee |