Hello Pali friends,
First the suttas. The term "nimitta", which means "representation", is discussed in the relevant thread.
Mahaparinibbana sutta
Ahaṃ kho panānanda, etarahi jiṇṇo vuddho mahallako addhagato vayo anuppatto. Āsītiko me vayo vattati. Seyyathāpi ānanda, jajjarasakaṭaṃ vekkhamissakena yāpeti, evameva kho ānanda vekkhamissakena maññe tathāgatassa kāyo yāpeti. Yasmiṃ ānanda, samaye tathāgato sabbanimittānaṃ amanasikārā ekaccānaṃ vedanānaṃ nirodhā animittaṃ cetosamādhiṃ upasampajja viharati, phāsutaro ānanda, tasmiṃ samaye tathāgatassa kāyo hoti.
"Now I am frail, Ananda, old, aged, far gone in years. This is my eightieth year, and my life is spent. Even as an old cart, Ananda, is held together with much difficulty, so the body of the Tathagata is kept going only with supports. It is, Ananda, only when the Tathagata, disregarding representations, with the cessation of certain feelings, attains to and abides in the representation-less concentration of mind, that his body is more comfortable.
http://www.accesstoinsight.org/tipitaka ... .vaji.html
Culasuññata sutta
182. ‘‘Puna caparaṃ, ānanda, bhikkhu amanasikaritvā ākiñcaññāyatanasaññaṃ, amanasikaritvā nevasaññānāsaññāyatanasaññaṃ, animittaṃ cetosamādhiṃ paṭicca manasi karoti ekattaṃ. Tassa animitte cetosamādhimhi cittaṃ pakkhandati pasīdati santiṭṭhati adhimuccati. So evaṃ pajānāti – ‘ye assu darathā ākiñcaññāyatanasaññaṃ paṭicca tedha na santi, ye assu darathā nevasaññānāsaññāyatanasaññaṃ paṭicca tedha na santi, atthi cevāyaṃ darathamattā yadidaṃ – imameva kāyaṃ paṭicca saḷāyatanikaṃ jīvitapaccayā’ti. So ‘suññamidaṃ saññāgataṃ ākiñcaññāyatanasaññāyā’ti pajānāti, ‘suññamidaṃ saññāgataṃ nevasaññānāsaññāyatanasaññāyā’ti pajānāti, ‘atthi cevidaṃ asuññataṃ yadidaṃ – imameva kāyaṃ paṭicca saḷāyatanikaṃ jīvitapaccayā’ti. Iti yañhi kho tattha na hoti tena taṃ suññaṃ samanupassati, yaṃ pana tattha avasiṭṭhaṃ hoti taṃ ‘santamidaṃ atthī’ti pajānāti. Evampissa esā, ānanda, yathābhuccā avipallatthā parisuddhā suññatāvakkanti bhavati.
"Further, Ananda, the monk — not attending to the perception of the dimension of nothingness, not attending to the perception of the dimension of neither perception nor non-perception — attends to the singleness based on the representation-less concentration of awareness. His mind takes pleasure, finds satisfaction, settles, & indulges in its representation-less concentration of awareness.
"He discerns that 'Whatever disturbances that would exist based on the perception of the dimension of nothingness are not present. Whatever disturbances that would exist based on the perception of the dimension of neither perception nor non-perception, are not present. And there is only this modicum of disturbance: that connected with the six sensory spheres, dependent on this very body with life as its condition.' He discerns that 'This mode of perception is empty of the perception of the dimension of nothingness. This mode of perception is empty of the perception of the dimension of neither perception nor non-perception. There is only this non-emptiness: that connected with the six sensory spheres, dependent on this very body with life as its condition.' Thus he regards it as empty of whatever is not there. Whatever remains, he discerns as present: 'There is this.' And so this, his entry into emptiness, accords with actuality, is undistorted in meaning, & pure.
http://www.accesstoinsight.org/tipitaka ... .than.html
