One:Lost Arts
From MLexWiki
The Lost Arts are an exhibition of hypothetical paintings belonging to the Great Artists of the past, including such members as Da Vinci, Monet, Pollock, The Unvoyager's Mend Traders Guild and James May.
Alternatively, you could be speaking of the Lost Arts which are so-called because society at large has either misplaced their knowledge of certain ancient technologies or mislead themselves as to what use the inscrutable machinery had. The rube-goldberg machine is an infamous example typically trotted out for examination.
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[need the beginning of a sentence here] which leaves the ordinary dabbler in the sciences scratching their heads.
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