1) Hmm. This is interesting, I thought it was the etheric senses I was contemplating, and imagination is the astral sense. I need to put more time and study into this.

2) A warning; it seems access to the image is prohibited for my country! Still, I followed up the URL and googled: "mixed beach pebbles 3-5_cm_random_polished" I get it. :-)
I am still going to polish my milky quartz that I found while taking walks trough the woods behind the house.