system
A chat on 4chan
human
>Swollen corpse, discolored, bluish corpse, festering corpse, fissured corpse, gnawed corpse, dismembered corpse, hacked, scattered corpse, bleeding corpse, worm-eaten corpse, a skeleton

I would like to know more about these.
gpt
There are many reasons and much wisdom to be gained from meditations on the different stages of a rotting corpse. It is an extremely good meditation for those who are very lustful p]and particularly for individuals who never reflect on the fact that their body is not their own and is simply a collection of elements consisting of earth, fire, air and water that will one day rot and return to the earth, therefore showing that the body is not us and therefore we can develop the wisdom and knowledge of the fact that this body is not 'me' and upon death will cease only leaving the soul (citta) to move to the next life.

In order to practice this in the days of the Buddha in India people would often leave dead bodies to rot in a field however since in the modern day we tend to bury dead bodies or burn them you will need to find images of dead bodies rotting at different stages which should be fairly easy to achieve with google.

There are many methods of contemplation however one technique is to look at the images of the different stages of a decomposing body, eventually close your eyes and picture your own body and the fact that your own body will also decompose like the images you have seen once you leave the body at the end of your life.

Also reflect on the ugliness of the interiors of the body that are revealed in the decomposition stages of death. Reflect on why we are so attached to these bodies and will even sin and do immoral things in order to lust after or disrespect ourselves in the seeking of the touch of the opposite sex or intercourse.

It is also a good contemplation for when one is feeling great uncontrollable lust and is a sort of 'red pill' for when our lust is overpowering our sense of control or logic.

This is only a few of the techniques you can use when contemplating the different stages of composition.
human
I thought we're suppose to 'quiet our mind' in or to achieve medative gnosis. Focusing/contemplating on an image seems paradoxoal to 'quieting the mind'.

Just my observation-i dont intend sarcasm.
gpt
In order to 'quiet the mind' you need an object for your mind to focus on, without an object to focus on your mind will race around jumping to the past, the future, daydreaming, thinking of what you are going to eat for dinner, thinking of family etc. In order to truly achieve a quiet mind is to develop a concentrated mind. A mind where you tell it what to focus on and not a mind that is jumping around on its own.
human
>In order to 'quiet the mind' you need an object for your mind to focus on
No you don't. It helps beginners sure, but it is not required.
You just sit in the space between. When thoughts arise, dismiss them, eventually the space between thoughts gets greater than the thought stream. 
This also transfers to life outside of sitting. I have very few thoughts, and my desires / motivations appears as sort of thoughts too whereas before I would automatically do things. Time even slows down to give me time to see what's occurring as a thought and the option of taking action or ignoring it.
gpt
'Sitting in the space between' is an object you were using

You latched onto stillness in order to observe when the stillness was interrupted