Does Summoning need line of sight?

[Hypersmurf]

I think someone ought to publish plans for a castle that uses mundane means to foil magic.

"The secret, boy, to an anti-wizard castle, is lead. Lots and lots of lead. Lead in the walls. Lead in the ceilings. Lead in the water pipes. Lead dinner plates, lead wine goblets, lead tables, lead chairs..."

"... now, boy, we need to get these cabbages properly painted, or we'll never be ready in time for the spaghetti fashion show..."

-Hyp.