Kant: Espacio y Tiempo
was that space and time are neither, as the English physicist Sir Isaac Newton supposed, vast containers inside which everything empirical is situated nor, as Leibniz had suggested, relations between things confusedly apprehended but are rather what he mysteriously called "pure intuitions," factors inherent in the sensibilities of observers. Without observers space and time disappear along with their contents; but once the human point of view is assumed, in the form of percipients who are directly aware of the world through their senses, space and time become as real as anything-indeed, more real because of their pervasive character.