From the Depths of 'The Shallows'

It is our intellectual technologies that have the greatest and most lasting power over what and how we think. They are our most intimate tools, the ones we use for self-expression, for shaping personal and public identity and for cultivating relations with others…Every intellectual technology, to put it another way, embodies an intellectual ethic, a set of assumptions about how the human mind works or should work.
Nicholas Carr

Nicholas refers to Nietzsche and the typewriter, but I immediately thought about iPad.