There is another kind of 'blindness' for which the word blindess and the
word undiscovered are both close but inadequate. Consider our environment,
wherein it is possible to see ways to develop cellular telephones, radio,
and GPS. These commonplace things could not be seen without the aid of
previous work on electromagnetism, that created an environment in which
they could exist as concepts.
In another vein, consider the Tarot deck, wherein are depicted a set of
situations, which aid the viewer in sparking a series of neurons that might
be less travelled. This can be used as a method of seeing, where one does
not normally travel, a dreamlike connection of things less often connected,
which can lead to personal insights that normal logic circuits would not
arrive at. A problem that I have noticed with the Tarot deck is that the
set of situations/relationships portrayed seem stiflingly small and
repetetive, even for the number of cards. A better deck would seek to make
use of the most common situations/relationships, in descending order.