Ghosts and Inferi ("Ghosts are transparent")

[jmwcfo]

No: HPFGUIDX 167447

--- In HPforGrownups at yahoogroups.com, career advisor <aceworker at ...>
wrote:
>
> In HBP Snape asks Harry to explain the difference between Ghosts and
Inferi. And Harry's infamous answer is that: "Ghosts are transparent."
>
>   But why does JKR have Snape ask this seemingly bizarre question?
>

JW:

On the most basic level, it is background info and foreshadowing for
the later confrontation with the inferi in the cave.  Anybody see
anything deeper than that?