Materials List: Basic Categorization Practice:
See, Touch and Discover

• blindfolds, enough for half the class; alternatively: use small lidded containers such as ice cream containers, tissue boxes or shoe boxes so that students can put their hands inside to feel the objects without seeing them
• a selection of objects, enough quantity and variety so student teams have their own sets of objects so that each partner identifies different objects. Example objects: rocks, pinecones, leaves, seashells, wood, plastics, pens, pencils, paper, Styrofoam, fabric, leather, wool, cotton, corks, sponges (sea and artificial), fruits, vegetables.
• Touch and Discover Worksheet

https://www.teachengineering.org/activities/view/touch_and_discover