![Centuries-old technique reveals hidden '3D' animals in Paleolithic cave art](https://ic-cdn.flipboard.com/futurecdn.net/a4093f866b90f2abbc71f51bff893b541f98c901/_xlarge.jpeg)
The hidden animals were revealed on cave walls in Spain with 'Magic Eye'-style techniques. After taking the cave wall's contours into consideration, …
Author: Kristina Killgrove
* VIEW the article originally published here.
** MORE curations: Al Cannistra at San Antonio ONE here.