The tube reminds me of a piece of Sufi wisdom (Rumi). Associating a tube with a flute, one can see this instrument as an analogy to man, or to the heart. Gods love penetrates the heart. The heart must be empty to provide room for this love. Rumi associated holes in the tube / flute with experiences ...

What a great forum - thanks for all contributors who add so much insight. I think these few lines about the crack in everything are really central - they help understand the brokenness of our lives, and how at the same time the divine is always there. So we "just" need to be open for these...