I’ve been doing these practices for a long time in many permutations and have found them to be extremely useful and effective. When you start to see results, when you see the actual transformation in perception then they are seen as medicine, the aversion to them is dispelled and they’re really appreciated. Many of the acclaimed Thai masters have used them as a part of their practice. Of course, practice is not ‘one size fits all’, and it needs to suit the needs and conditions for each practitioner at that specific time.
To highlight the beneficial effect and to be able to see them as a balm and medicine The Adantagutta sutta (Untamed, Unguarded), presents the results of the practices in a really inspiring way SuttaCentral SN35.95 I hope you enjoy it, It is such a beautiful verse
Not being moved by perceptions of pleasant or unpleasant, one is unmoved and all craving/grasping is ended… the end point - Nibbana
Ashuba practices directly contribute to changing perception so as to dispel craving. The way they do this is to demonstrate that there is no intrinsic/permanent ‘pleasant’ or ‘unpleasant’ in any thing… we just believe there is due to conditioning. The conditioning can be so strong that it is unimaginable that it could be seen any other way, that the ‘pleasant’ can really be ‘unpleasant’. This results in really strong craving and engagement, grasping striving, becoming etc. The training is to break through this in many ways, one of which is seeing the unpleasant in the pleasant. and this is especially used where some specific objects are strongly desired because of the illusion of how wonderful they are. Since the body, and desire for the opposite sex is a common issue, contemplating the unpleasant in what is otherwise perceived as pleasant is a direct antidote When one has actively and purposefully transformed ones perception of an object, it becomes clear how insubstantial perception itself is… how it is completely conditioned and based on illusion/delusion. So in this way it has a much deeper effect than simply as an antidote to a particular craving, if you take it deeper.
When one trains in flexibility of perception and expands it and takes it further and applies it to more things in all sense modalities, it highlights the insubstantiality of all perceptions… the principles underpinning the practice are about realising that there is nothing inherent or permanent in any thing perceived, it is simply dependently arisen
… and the end point of practice… Nibbana. This is seeing only the seen in the seen etc - ie seeing things as they really are - and then what is there to crave?
SuttaCentral.
“Just six, O bhikkhus, are the bases for contact,
Where one unrestrained meets with suffering.
Those who know how to restrain them
Dwell uncorrupted, with faith their partner.
“Having seen forms that delight the mind
And having seen those that give no delight,
Dispel the path of lust towards the delightful
And do not soil the mind by thinking,
‘The other is displeasing to me.’
“Having heard sounds both pleasant and raucous,
Do not be enthralled with pleasant sound.
Dispel the course of hate towards the raucous,
And do not soil the mind by thinking,
‘This one is displeasing to me.’
“Having smelt a fragrant, delightful scent,
And having smelt a putrid stench,
Dispel aversion towards the stench
And do not yield to desire for the lovely.
“Having enjoyed a sweet delicious taste,
And having sometimes tasted what is bitter,
Do not greedily enjoy the sweet taste,
Do not feel aversion towards the bitter.
“When touched by pleasant contact do not be enthralled,
Do not tremble when touched by pain.
Look evenly on both the pleasant and painful,
Not drawn or repelled by anything.
“When common people of proliferated perception
Perceive and proliferate they become engaged.
Having dispelled every mind-state bound to the home life,
One travels on the road of renunciation.
“When the mind is thus well developed in six,
If touched, one’s mind never flutters anywhere.
Having vanquished both lust and hate, O bhikkhus,
Go to the far shore beyond birth and death!”