The kasiṇas are ten objects of concentration described in the Visuddhimagga: earth, water, fire, air, blue, yellow, red, white, light and space. The meditator gazes at a disc until its image can be held with the eyes closed, and develops it into a luminous counterpart sign that leads to absorption.
Kasiṇa
A meditation device, such as a coloured disc or element, used to develop concentration.
Also: Kasina