@Bishopjoey @gutenberg_org well my favourite isn’t as worthy or high culture as your two but is “ The Men from P.I.G and R.O.B.O.T” by Harry Harrison.
Out right pulp space opera but to the 6 year old me, it made me fall in love with reading and opened my eyes to the world of imagination that literature can give humanity.
I still have the copy I got when I was 6. It’s as Pratchett would say “slightly foxed… badgered, wolved and possibly beared as well. ” And very precious.