Delson talks about the arupa Jhanas which are the bases of the 4th jhana.The base of infinite space-KarunaThe base of infinite consciousness -MuditaThe base of nothingness-UpekkhaThe 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.infohttps://buddhapada.in/ https://www.dhammasukha.org/getting-started-with-twim Where: Dhamma Sukha Meditation Centerhttps://www.dhammasukha.org