When Van and Ada watch Kim Beauharnais's album, Van Veen (the narrator and main character in VN's novel Ada, 1969) mentions the remote mirage in Effrontery Minor:
‘Well,’ said Van, when the mind took over again, ‘let’s go back to our defaced childhood. I’m anxious’ — (picking up the album from the bedside rug) — ‘to get rid of this burden. Ah, a new character, the inscription says: Dr Krolik.’
‘Wait a sec. It may be the best Vanishing Van but it’s terribly messy all the same. Okay. Yes, that’s my poor nature teacher.’