Oh what a joy to read your responses! I became involved in zen practice about 7 years ago, have now taken vows , not as a nun, I'm too attached to my hair! But more as a sort of, yes, this belief system fits me , way.
It is about mindfulness in every moment, but not in an attached, grasping, sort of way.
It's roots are from the Buddha through disciples in china and Japan but now there is a western zen set up.
Yes, there's lots of sitting in front of a blank wall, called zazen. Partly as a discipline to let go of attachment to thoughts and also practice at being present in each moment. I do find when I'm fully present in each moment I feel more compassionate, less judgemental etc etc.
Lovely to hear your responses!