Use becomes part of identity
A pencil case can combine wood, eraser, plastic, graphite and fabric rather than one single source.
EXPLAINER
Smell & Personal Objects
Objects we handle often—pencil cases, towels, shoes, books and clothing—collect material, product and environmental smell cues.
New and used states differ
New Shoes and old textiles show how manufacturing, storage and use reshape material smell.
Personal does not mean private inference
SmellBook can describe an object without making judgments about its owner or their habits.
Personal-object profiles remain descriptive and do not infer identity, hygiene or behavior.