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harry potter - Why couldn't Luna do "Accio shoes"?


Luna said that she often had people take and hide her things because she was odd.




'Well, I've lost most of my possessions,' said Luna serenely. 'People take them and hide them, you know. But as it's the last night, I really do need them back, so I've been putting up signs.' (OotP).



Did JKR ever indicate in interviews/Pottermore why Luna couldn't simply get them back by "Accio"-ing them? (out of universe, it's likely because it gave Harry a reason to pity her; and to do character development by discussing her mother's death).



Answer



As we see in "Deathly Hallows" there are such things as anti-summoning charms;



‘There’s an easier way,’ said Hermione, as Harry wiped his inky fingers on his jeans. She raised her wand and said, ‘Accio locket!’ Nothing happened. Ron, who had been searching the folds of the faded curtains, looked disappointed. ‘Is that it, then? It’s not here?’ ‘Oh, it could still be here, but under counter-enchantments,’ said Hermione. ‘Charms to prevent it being summoned magically, you know.’ ‘Like Voldemort put on the stone basin in the cave,’ said Harry, remembering how he had been unable to Summon the fake locket.



Harry's cloak also seems to have an enchantment that prevents anyone other than the owner from summoning it;




Harry seized Ron’s wrist as he raised his wand. There were too many of them to Stun: even attempting it would give away their position. One of the Death Eaters waved his wand and the scream stopped, still echoing around the distant mountains. ‘Accio Cloak!’ roared one of the Death Eaters. Harry seized its folds, but it made no attempt to escape: the Summoning Charm had not worked on it.



It's likely that anyone who was deliberately hiding something would put such a charm on the hidden object.


Additionally, accio'd items still need to travel physically. If you hid something inside something relatively immovable (such as by putting it under a flagstone) it wouldn't come when summoned.


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