Robert Silverberg said this quote
“ There are our ghosts,' Smithers said.It was a word he liked to use, said Brewster. Like most of us Brewster had read a few ghost stories, and to him the word 'ghosts' summoned up the creaking floorboards of a haunted house, shrouded white figures gliding silently through darkness, fluttering robes moving of their own bodiless accord, strangely transparent coaches travelling swiftly down a midnight road, and other such images quite remote from the chanting and drumming of desert folk in gaudy garb, with jingling anklets and necklaces, under a hot fierce sun. But the sounds of the Thar came from some invisible source, and to Smithers they were sounds made by ghosts.(Smithers And The Ghosts Of The Thar) ”