Because Squibs held a special status, descriptions of Squibs in books were actually few and far between.
To many wizards, "Squib" could be equated entirely with "Muggle"; neither was worth studying.
Because of these ideas among wizards, it was easy to overlook certain hard-to-explain matters;
To avoid disturbance as much as possible, Hogwarts Castle was protected by Anti-Disapparition Magic, Unplottable magic, and countless other spells;
Under the protection of all kinds of magic, when Muggles looked toward Hogwarts Castle, they could only see a stretch of crumbling ruins, even with a danger warning sign...
If that was the case, then why could Squibs, known as "Muggles born of wizards," such as Filch... serve as caretaker and administrator?
To most wizards, though such a question was hard to explain, they did not care at all.
Using the question "Can you see Hogwarts Castle?" as a basis, Vizet asked a relatively tactful question.
"Mr. Filch, do you still remember... what it felt like when you first came to Hogwarts?"
"When I first came to Hogwarts..." Mr. Filch slowly said. "What it felt like?"
He stopped stroking Mrs. Norris's back and looked around. "I felt... that being able to come here was truly wonderful!"
"This is the grandest, most magnificent castle I've ever seen! And it's so magical! Even the staircases are enchanted; they can move however they like... If only Peeves weren't here!"
"Oh!" Fred started teasing again. "That sounds wonderful!"
"It does!" George nodded repeatedly with a grin. "Filch deeply loves this castle!"
"So what if I do!" Mr. Filch looked at Fred and George and glared at them fiercely. "You two are as hateful as Peeves!"
"Thank you for the compliment!" Fred and George bowed at the same time. "It is our honor!"
Mr. Filch's answer proved something obvious, something