A meeting of two thoughts in logical thinking is different from that in prelogical thinking. Indigenes aren't "idiots", and in some things, they reason far better than we do. But it's all about the type of perception. Or rather the type of thinking that occurs during perception. They don't have concepts they have "perceived notions". A kid-"engineer" plays in his childhood: he builds things out of sticks, planks, little bricks. Then he studies, finishes a university, and builds for real. People don't say that he's playing - he's doing real work. A person who hasn't been an actor won't understand this. To him, this might simply sound like an abnormal, unstable psyche. Though, if he remembers that his childhood games consisted almost entirely of imagining himself as someone else parents a horse, a train - then he might stop being so surprised. But then he'll assert that this is an undeveloped psyche, one fit for children, not for an adult.