definition by association?

so how is it that we know
what colours may be
how is it we know that blue be the colour of the sea
green be the grass and leaves on the tree
hues of gold brightness, yellow the rays of the sun be.
so point at the item, give it a colour, that colour has a name
and should the hue be similar of another object, thus the colour the same
then follow the evolution.... dark and light and pastel and more
a finer definition and detail of colour required for sure.

now if that be the case a colour to know
would the same principle apply for shapes on show
and thus if at my picture u should look
there be a heart on display, unless i be mistook....(wink).

RB.