FORTH POSITION OF MASTERY

28. ‘When a man without the subjective idea of form sees externally forms which are boundless, and pleasant or unpleasant to the sight, and having mastered them, is conscious that he knows and sees–this is the fourth position of mastery.

Buddhist Suttas – MAHÂ-PARINIBBÂNA-SUTTANTA 
Translated from Pâli by T. W. Rhys Davids [1881]
http://www.sacred-texts.com/bud/sbe11/sbe1103.htm