"Terms like 'man cave, ' 'underwater' (when used to describe mortgages), 'earworm' and 'bucket list' paint vivid pictures in your mind, " he said.

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According to Huntford, cave drawings suggest that man used skis during the last Ice Age in the Palaeolithic period.

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And most clients find themselves hanging out after a fitting in the man-cave setting, which is complete with a pool table, flat screen tvs, and a fully stocked top-shelf bar.

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There's also a man-made cave and multiple waterfalls.

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When Stone Age man produced their remarkable cave paintings they often left handprints on the walls produced by blowing pigments from one hand through a tube held by the other hand.

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The cave, certainly, is an occasion for easy irony: the man who has perhaps done more than any other person to entice generations of children to spend their playtime indoors, in front of a video screen, happened to develop his peculiar talent while playing outdoors, at whatever amusements or mischief he could muster.

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Man has been involved in architectural pursuits since he first left the cave.

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