What kind of wood is this? Maple?
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I don't know what it is, but the one on the bottom right looks wicked cool.
EDIT: If you click the picture, it brings you to the Burl Source site. It's walnut.
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Are those lines that run the length of the flamed redwood part of the grain? They look like they must be since they're kind of wavy (i.e. not ground in).