Due to the special status of Squibs, there were actually very few descriptions of them in books.
To many wizards, "Squib" was practically synonymous with "Muggle"; neither seemed worth studying.
These notions held by wizards made it easy for them to overlook certain hard-to-explain things.
To avoid disturbance as much as possible, Hogwarts Castle was protected by countless spells, including Anti-Apparition Magic and the Unplottable Charm.
Under the protection of those various spells, when Muggles looked toward Hogwarts Castle, all they could see was a dilapidated ruin, along with a danger warning sign...
If that was the case, then why could Squibs—known as "Muggles born to wizards"—such as Filch... serve as the caretaker and groundskeeper?
For most wizards, although such a question was difficult to explain, they simply did not care.
Using the question "Can you see Hogwarts Castle?" as a basis, Wizet asked a relatively tactful question.
"Mr Filch, do you remember... what it felt like when you first came to Hogwarts?"
"When I first came to Hogwarts..." Filch slowly began, "What did it feel like?"
He stopped stroking Mrs Norris's back and looked around. "I thought... it was wonderful to be able to come here!"
"This is the grandest, most magnificent castle I've ever seen! And it's so magical! Even the staircases have magic and can move around freely... It would be perfect without Peeves!"
"Ooh!" Fred began teasing him again. "That sounds wonderful!"
"Yeah!" George nodded repeatedly with a grin. "Filch really loves this castle!"
"So what if I do!" Filch looked at Fred and George and shot them a vicious glare. "You're just as annoying as Peeves!"
"Thank you for the compliment!" Fred and George bowed at the same time. "It's an honor!"
Filch's answer demonstrated one obvious thing, enough to prove that the claim that