🔺⚪⬛ Montessori Sensorial Material – Geometric Solids Observation & Assessment Checklist Form Understanding three-dimensional shapes through touch, sight, and movement. The Montessori Observation and Assessment Checklist for Geometric Solids is a thoughtfully designed tool to help educators observe, document, and assess a child’s understanding of 3D shapes, spatial awareness, and geometric vocabulary through concrete, hands-on exploration. This checklist supports children as they handle, compare