The Fire wood will never run out.
As for the mosaic it is used for something else as well

You could look in the
Guides Section to find your answer.
If you want the exact answer then you should highlight the space.Start HighlightingAfter finishing Puzzles 6 and 10, drop a totem in the center of the uncovered mosaic to reveal a piece of the gong.Stop Highlighting
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I haven't been on the forums in a long time, I hope you all remember I am a boy