Prehistoric cave occupants paid attention to cave wall morphology and touch when creating hand stencils. Human occupants of two caves in Northern Spain put some thought into where they placed their hand stencils on cave walls as much as 37,000 years ago, during Palaeolithic times. The topography and physical characteristics of the walls in the low light conditions of the caves seem to have mattered to them, suggest a team of researchers... What they found was a pattern that indicated selection or attention to certain types of natural cave wall features for placement of the stencils. "In total 80% of...