Here are some additional references on the six-spheres and contact.
On the cessation of the six-spheres:
SN 35.65, SN 35.66, SN 35.67 and SN 35.68
These four explain that when there is no eye, no form and no eye-consciousness
then there is not "Mara" (death), "a being" (satta?), Suffering (dukkha) or
"a world" (loka).
SN 35.7 " ... the well-taught ariyan disciple cares not for an eye that is
past, is not in love with an eye to be, and for the present
eye, seeks to be repelled by it, seeks dispassion for it, seeks
the ceasing of it." [ PTS Kindred Sayings IV page 3 ]
SN 35.154 " If a brother preach a doctrine of repugnance for the eye, for
it's fading out, for it's cessation, he may well be called
a brother who is a norm-preacher." [ PTS K.S. IV page 89 ]
SN 35.130 "Herein, housefather, seeing a pleasant object with the eye,
a brother, at the thought "this is such and such" comes to
know of eye-consciousness that is pleasant to experience.
Owing to contact that is pleasant to experience arises
pleasant feeling." [ PTS KS IV page 72 ]
SN 35.96 "Herein, brethren, at sight of an object, evil unprofitable
states arise in a brother, memories and plans, akin to the
fetters that bind. If a brother welcomes that object, rejects
it not, puts it not away, wipes it not out, does not make it
go to utter destruction, thus should a brother understand
of it: "In profitable states I fall back. This was called by
the Exalted One "falling back." [ PTS KS IV page 45 ]
SN 35.95 " ... in what is seen you will have only the seen."
SN 35.90 " He should not imagine: 'I have an eye'."
SN 35.30 " He imagines not: I have an eye."
SN 35.31 Shows that "aggregates", "elements", and "spheres" are the same
thing, classifications of things which are clung to.