"...Hohlenstein-Stadel is the only cave in the region where archeologists have found no everyday tools, bones, or rubbish. It is deeper than theother caves too, It's not difficult to imagine that within its chambers early hunters venerated the Lionman and that Hohlenstein-Stadel Cave was an early (40,000 years ago) locus of prehistoric religion. This was 'a holy place.'..." -- "The first artists," Chip Walter and Steven Alvarez, National Geographic, January, 2015, p 58.
"...America's Large Underground Xenon detector, the most sensitive of its kind, is situated in Lead, South Dakota, right off Main Street and 4,850 feet down by elevator. It started operating in 2013 but came up empty-handed. It is currently resuming the search at a higher sensitivity. Other searches produced ghostly clues, but none has found definitive evidence of dark matter...." -- Timothy Ferris and Robert Clark, "The first glimpse of the hidden Cosmos," National Geographic. January, 2015, p.118.
It seemed to me that these two quotes belonged together. I will never know why our ancestors went so deep underground to look for meaning. Scientists say that dark matter, whose detection may be the next step on the path toward the explanation of everything, might only reveal itself if undistracted by "light" matter, (ie. the world of appearances) Going deep underground limits the effects of "particles of light matter" which are always floating around on earth's surface. The laboratory and the sanctuary are similar in being (partially) sealed off from the influence of that which might interfer with finding "reality" or some little piece of it. Coming up empty may be because, as the scientists say, we have not yet developed the right theories or the right tools. Or it may be because, as the mystics say, we creatures are not equipt to approach the Creator with our creaturely understandings and tools. These two statements may be saying the same things.