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I saw these photographs a few months ago, and was struck by the ingenuity of the collector in finding such an interesting theme in collectables. I was sufficiently inspired to search for similar rocks. They seem to be much scarcer than one would think, given the ease with which the human mind accepts the recognition of a face. To date I have found nothing worthy of display.
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ColdMonkey mines Gridcoin through generating BOINC computations for science.

If you're interested in rocks that vaguely look like sculls I recommend checking out The Alien Fossil Project. But be warned, it may be a total waste of your time.

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