We start with the basic psychology: humans are wired to notice faces, and that makes a near-double feel instantly important. The key exam idea here is that lookalikes trigger a clash between our belief in uniqueness and the brain's habit of pattern matching.

This chapter covers the digital engine behind modern lookalike culture: social media, reverse image search, and algorithmic comparison. The exam takeaway is that technology does not create resemblance, but it massively increases our ability to find, compare, and circulate it.

Here we focus on the feeling itself: the mix of recognition, discomfort, and curiosity that people describe when they meet a double. The main exam point is that the uncanny reaction comes from conflict in perception, not from anything supernatural.