This is a mathematical enlightenment toy for children over four years old. The concept of equivalent replacement is extracted from Cao Chong Weighs the elephant. Use single triangular and square magnetic accretion blocks to spell out irregular patterns, such as animals, fruits and other patterns that children like, and calculate the area according to the number of blocks.

Shanghai Art and Design Academy is the only independent art and Design Vocational College in Shanghai. It is the only higher vocational college in Shanghai to undertake the pilot of the reform of the national education system. New entrepreneurial experience in Colleges and universities.Shanghai Art and Design Academy has gradually formed the development thought of "inheriting tradition, creating the contemporary era and expanding the future", and has accumulated a strong comprehensive strength for running schools.