Hmmm - I've always thought you could see the effect of the vertical stack every time you were out for a walk and found yourself four feet in the air with your

Hmmm - I've always thought you could see the effect of the vertical stack every time you were out for a walk and found yourself four feet in the air with your brain going "My bad dude - stick, not a snake "- I only read the linked article, but on the surface, it seems like imputing magical properties to the stack it doesn't need - if you just look at it as a mechanism for allowing certain signals to move across the hierarchy because they are extremely beneficial in bundling the wider range of information that's rising up from the broader lower hierarchical layers. My 2c admittedly.