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Lo! and behold. 'Rock/Fire/Scissors/Paper/Rock/Fire/Scissors...'
represents Rook/Falcon/Bishop/Knight...  So, the old selection game of
Rock, Scissors and Paper has unobserved element 'Fire' now (also Water,
Fire, Air, Earth). Moreover, math equation 'e to the (pi, i) equals minus
one' corresponds exactly and appropriately, in order, with 'e' as Rook
(base 10), pi as Bishop, i as Knight (for its different imaginary  mode), and 'minus one' as Falcon (summation & resultant). In fact, wider numerical, scientific and mythological matches emerged  about year 2000 eight years later: 
Sun     Sunday       Gold Au   Great Pyramid    Falcon        Electra(F) 
Moon    Monday       Silver Ag Artemis' Temple  Dove,Chicken  Merope(P) 
Mars    Tu(martes)   Iron Fe   Colossus Rhodes  Hawk          Sterope(N) 
Mercury Wednesday    Hg        Lighthouse Pharos  Vulture     Maia(B)  
Jupiter Thursday     Tin Sb    Statue of Zeus   Bird of Jove  Taygete(K) 
Venus   Fri(viernes) Copper Cu Hanging Gardens  Bird-Goddess  Alcyone(Q)
Saturn  Saturday     Lead Pb   Mausoleum        Rook, Parrot, Calaeno(R)
                     [V]       [X]              [IX]  or Raven            
 The last column lists the classical Pleiades, whose respective histories
and personalities correlate with the 7 pieces.
Then also exist the seven 'animals' in order: Falcon(F), Lamb(P),
Horse(N), Elephant(B), Lion or Scorpion(K), Totemic Hawk(Q), and
Serpent(R) out of Poem XV ''Piece Offering.''