Idea

A network of public outdoor classrooms shared by all schools within an area

Image credit: Outclass

Darko Savic Nov 09, 2021

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A network of outdoor public classrooms, scattered around parks and forests within walking distance of schools. A central website shows the occupancy and reservation schedule for each classroom. Any group can use them.
Why?
Make education more pleasant and fun.
Make it easy for a teacher to take the pupils out into nature.
A more affordable and widely accessible alternative to this.
Kids spend a substantial percentage of their youth enclosed in classrooms. Spending more time outdoors improves cognitive function, brain activity, blood pressure, mental health, physical activity, and sleep. 
How it works
A central website contains a list of all the outdoor public classrooms in an area. Teachers can book them ahead of time or check whether one is available for a spontaneous excursion.
Each classroom has a QR code. The teacher scans it and gets taken to the website where they can mark it as occupied. This saves other teachers from bringing their pupils only to find an occupied classroom.
People can submit feedback, suggest fixes and upgrades, etc. 
Who builds them
The outdoor classrooms could be built by:
volunteers
arhitecture students as part of the curiculum
woodcraft or technical school students
comissioned by the city
comissioned by ministry of education
one classroom paid for by each school's budget
parents in groups
Here are some photos showing what such outdoor classrooms might look like:

[1]Jimenez, Marcia P et al. “Associations between Nature Exposure and Health: A Review of the Evidence.” International journal of environmental research and public health vol. 18,9 4790. 30 Apr. 2021, doi:10.3390/ijerph18094790

outdoors education

Creative contributions

Classrooms in different regions

Shubhankar Kulkarni Nov 13, 2021

Such classrooms could be situated in different regions (habitats). For example, near a lake, banks of a river, green forest, grassland, farmhouse, etc. so that there can be a variety of things for the students to observe and ask questions and learn about. They might be taught the relevant topics there for a more hands-on (real) kind of learning. Learning about animals in a classroom at the zoo would be exciting. For university students, learning about art at a museum would be equally exciting. They could learn and then observe or draw, take notes of the exhibits.