Totoro appears only when Mei has already internalized Shinto shrine logic: the acorn ritual, the forest as inhabited rather than empty, the understanding that entities deserve respect before they're proven useful.

He's not summoned by innocence — he's summoned by cultural memory made flesh.

Watch the sequence before his first appearance. Mei doesn't skip into the forest thinking magic will happen; she bows at the shrine, places acorns carefully, and recognizes the forest as a place where old rules still apply. This isn't whimsy. It's protocol.

By the 1980s, Japan's post-war economic machine had spent thirty years converting shrines into heritage sites, folk knowledge into nostalgia, and intergenerational ritual into something grandmothers did while real families lived in salaryman apartments and processed meals. The film's true horror arrives quietly: when the grandmother leaves, Mei loses access to the infrastructure that summoned Totoro. Not because Totoro dies, but because the knowledge transfer stops. Satsuki, older and educated in the modern system, cannot see him at all — she has no acorns, no shrine-logic, no reason to believe the forest operates on anything but commodity logic.

The film never says this directly, but it shows the economic fact underneath: spiritual resilience, in post-war Japan, had been converted from a public good maintained by shrine networks, seasonal rituals, and village structure into a private good dependent entirely on individual willpower and family memory. Once that knowledge leaves the household, there's no external institution to replace it — you're alone with your anxiety, and the forest provides nothing to those who don't know how to ask.