“NESTOOL” allows accommodating various seating heights from a child to an adult, configured in six groupings. The seating heights are specifically guided according to “EN 1729-1 size mark standard” as the ergonomic guide for recommended chair and table. It becomes counters, display tables and seating arrangements for all. It reflects the unity; regardless of gender, age, race, nationality, and physical difference, “NESTOOL” welcomes everyone to sit on yet when it stacked one atop another it serves as shelves and display stand.