High Lonesome

And on Page Seventy-Five, Sayadaw suggests expanding that white kasina even further to all ten directions until 'all you see is white.'

From the Buddha (Anguttara Nikaya):
"Monks, there are the ten kasina devices (for concentration). What are the ten? Someone perceives the earth kasina, above, below, on all sides, undivided, unbounded; another person perceives the water kasina... the fire kasina... the wind kasina... the blue... yellow... white... red kasina... the space kasina... the consciousness kasina, above, below, on all sides, undivided, unbounded. These are the ten kasina devices. Among these ten, this is the highest — when one perceives the consciousness kasina above, below... unbounded. There are, indeed, monks, such persons who perceive in that way. But even for persons who thus perceive, change takes place, transformation takes place.
"When seeing this, monks, a well-taught noble disciple is repelled by it; being repelled, he becomes disenchanted about the highest, not to speak of what is low.