While I was watching the movie adaptation of IT, I noticed that while Bill saw Pennywise digging holes for their bodies, he began to punch himself in the face, and mutter something. At first I didn't understand what he meant, until I realized that Bill was referred to as "Stuttering Bill" because of his speaking problem. Pennywise was mocking him for it.-AustinDR
Pennywise is a non-material entity from beyond the edges of the universe, merely projecting a body into this world. In what sense is a giant spider appropriate as its 'true' form? Because it's a creature that feeds on and draws strength from fear. What's the single most feared and reviled creature on Earth?
The book makes it pretty clear that IT's true form is not really a spider, that's just the closest approximation their human minds could come to. Though you're probably right about the "why", spiders are terrifying.
Last time I checked, spiders were helpful pest controllers and not evil eldritch abominations. Poor arthropods...
That doesn't change the fact that a huge percentage of the human population are terrified of them.
Why does it matter (in the book, anyway) that none of the Losers have kids? Because having children means having to put aside your own interests to focus on your children. Bill, Beverly, and Eddie are emotionally locked at the ages they were in 1958, Bill because he's still grieving for Georgie and hurting over his parents' distance from him, Beverly because her abusive husband regresses her to the age she was when her father was abusing her, and Eddie because his overbearing wife is a carbon copy of his overbearing mother. Ben, Mike, and Richie have made a living out of their childhood pastimes instead of outgrowing them. And Stanley, who did grow up, couldn't handle the impossible reality of what he'd gone through, and killed himself. This even applies to Henry, who didn't have the opportunity to have children, and stayed emotionally stuck as a twelve-year old; he's able to be empowered by IT because of his childlike ability to understand that it's not really his dead friends he's talking to...
Hell, this may even apply to IT. The Losers are only able to beat her as completely as possible after she's laid her eggs; her mentality is very much that of a cosmically spoiled brat for most of her appearances. But at the end, she rushes back to directly engage the Losers, even knowing how they can beat her, because she can feel Ben crushing her spawn.
Most likely the reason why none of the Losers can have kids is that if they did having the responsibility of having a kid to raise would keep them from running off to Derry on a potential suicide mission to take out IT, and if even one of the Losers with the exception of Stan didn't go to kill it, the very specific set of circumstances that need to occur for IT to be killed once and for all couldn't happen.
The full dramatic irony of the Losers' club: they really are losers. They lost each other. But they lost each other because they won.
IT is the most Dark Tower of the non-Dark Tower books. The Losers' club is a Ka-Tet and their cyclic battle with IT is a prime example of how Ka * the DT universe's form of fate works; the same events have a tendency to recur during both their encounters in 1958 and 1985, they can feel the force of the White when they form the circle, they can share Khef when they are togeher, and towards the end they feel Ka-Shume. IT itself is a creature from Todash space with its true form, the Deadlights, circling the outside of the Tower.
It's only in the book, but Beverly's father chases her all over town when he means to finally kill her. But think about it; he's a man in his forties who works a fairly exhausting job and drinks every night, where does a man like that get the energy to chase a healthy, fairly athletic twelve-year-old? From IT. Not only does IT crawl in behind the eyes of people you care about, it makes them stronger.