M V demo desperation + spoilers

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In the Myst V demo (mac) I used the tablet to make rain to fill the cups to
see the reflections of numbers. I mapped the numbers to symbols and "dialed"
those symbols on the stones around the observatory. Nothing happens. I
am stumped as to what to do next. I have tried setting the window stones
in the observatory various ways as well, with no results. If someone has
a hint that would be appreciated.