Delson talks about the arupa Jhanas which are the bases of the 4th jhana.
The base of infinite space-Karuna
The base of infinite consciousness -Mudita
The base of nothingness-Upekkha
The base of neither perception-nor-non-perception
Buddha Pāda Institute is situated in a lush forest in the outskirts of Kalimpong, India. It has a temple, prayer and teaching halls, workshop spaces, accommodation facilities, dining halls, and an upcoming Japanese tea room, library and cafe.
http:\\Delsonarmstrong.info
https://buddhapada.in/
https://www.dhammasukha.org/getting-started-with-twim
Where: Dhamma Sukha Meditation Center
https://www.dhammasukha.org