I don't know what the white screen is or where it cones from but I use it sometimes when confronted with a design problem.
My technique: relax, bring up the screen, let patterns, faces, anything manifest itself on the screen. GENTLY guide your focus to the problem that
needs to be solved and just sit back and watch. Usually nothing reveals itself but sometimes the results are astonishing.
If you are predominatly a visual type, the screen could be an asset as it is for me. Don't count out other methods.
Useing the screen for spiritual growth; beats me?
I prefer the mantra/tantra approach. In the past I used to play C# on the tenor saxaphone as a focal point for meditation.
I find the white screen a very interesting concept. Good luck with your search!

