Debian's which hunt

Exactly.

My brain thinks that copy, mv, etc all take a "copy" of the first argument, and leave it in the second.

ln is the "wrong" way round, in that it leaves a copy of the second argument in the first.

THAT is why there is no such thing as "intuitive" software - what you think of as bleeding obvious, I think of as "who the hell designed that monstrosity!" (and vice versa, of course :-)

Cheers,
Wol