The Smelling Boxes (A120) are a classic olfactory sensorial material for the primary classroom, consisting of paired containers filled with scented substances that children match by smell alone. They isolate the sense of smell in the same way the Color Tablets isolate vision, giving children language and discrimination practice in a sensorial area that's easy to overlook. Having a reliable, well-sealed set is essential since contamination between scents quickly undermines the lesson.