What do you with the tuning forks on spyro dawn of a dragon?

The tuning forks in Spyro: Dawn of the Dragon are placed in the Dragon Shrine. Once all four are in place go talk to the dragon in the shrine.

+:What happens when a tuning fork that is still vibrating touches wooden desk?
+:When a table tennis ball on thread is made to touch the vibrating prong of tuning fork swings backwards and forwards.?

Magic Tricks

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