I recently learned about the concept of the uncanny valley, and it immediately reminded me of the following passage from The Lion, the Witch, and the Wardrobe, Chapter 8 (emphasis mine):
"No, no, there isn't a drop of real human blood in the Witch."
"That's why she's bad all through, Mr Beaver," said Mrs Beaver.
"True enough, Mrs Beaver," replied he, "there may be two views about humans (meaning no offence to the present company). But there's no two views about things that look like humans and aren't."
"I've known good Dwarfs," said Mrs Beaver.
"So've I, now you come to speak of it," said her husband, "but precious few, and they were the ones least like men. But in general, take my advice, when you meet anything that's going to be human and isn't yet, or used to be human once and isn't now, or ought to be human and isn't, you keep your eyes on it and feel for your hatchet."
Was CS Lewis making a deliberate reference to the philosophical concept of the "uncanny valley?" For that matter, did the latter idea even exist back then - and if not, did it have a precursor, a related philosophical idea known about in Lewis's day, which did inspire him to write this?