How Abstract Ideas Shape Our Practical Perceptions IDEAS Posted: June 25, 2021 2:29 pm They are imbued with grandeur precisely because of their superb indifference to mundane human concerns. Having knowledge is practically useful, but why would we also need the concept of knowledge? – Aeon Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to email a link to a friend (Opens in new window)