Ether splinter ?

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Hi all , I have been meditating on feeling ether as said in the hexagradior pdf , and today ( at 1:00am or something ) , i felt like there was a feeling of space or ether in my mind/brain . And when i visualized a colorless wave pushing against my palms [ ether ] , it actually worked much better than before ! But after some tens of minutes , that ( splinter ) in my mind gradually got away and i could not feel it . What was it ? It was not mentioned in that pdf ... an altered state of mind maybe ?