In this area children learn by using Montessori materials which are designed for them to feel differences in height, weight, colour, sound, smell, texture etc.
Hence the name Sensorial.
Consequently they absorb the idea of sequencing, comparing and matching.
Like Practical Life, it improves coordination and concentration and with this different abilities emerge. As they progress, children become fascinated with words and are then introduced to names and concepts like rhombus, ovoid, flat etc which are all parts of different exercises that work together as if in a grand puzzle.
Sensorial gives them the most firm foundation for Maths and Language in their later years.