Is there a Cosmic Cabinet or do we speak of areas of knowledge, such as astronomy, history, geography?

In the case of the Elementary students, the environment is set up with curriculum areas with materials to support the child’s exploration of the topics mentioned.  All these areas of exploration (traditionally referred to as curriculum areas) “house” materials to allow a child to follow their interest in any area of human knowledge. In small or large groups, an introductory lesson/story is given and then a child is free to follow whatever captures their interest to delve deeper. How and where the materials are stored depends on the teacher, the space (and sometimes the children!). In some of the very old environments you could occasionally find something referred to as “the cosmic cabinet”, but this term is no longer commonly used.

Montessori children science lesson