I’ve seen a bunch of theories about Robert’s tattoo and the symbol on the wall in the cult ending.
My brain says we must go full cheesy horror.
It looks like a cul-de-sac. A ring of houses, with an island of landscaping in the middle. There aren’t enough spokes on the symbol to be a perfect representation of our happy little Maple Bay cul-de-sac (with eight houses), but if my b-horror instincts are correct, it’s plausible that the cul-de-sac itself could be mimicking some evil arcane symbol or whatever. After all, it’s implied Joseph’s bizarro torture chamber thing in the cult ending is underneath the cul-de-sac, right?
Personally I think that would be really darkly funny and fit in perfectly with Joseph’s nice white suburban dad about face into creeper town.