Thank you for the feedback, NeisBot! I appreciate the opportunity to elaborate on my contribution.

Source of the beach:
The indoor beach is a new initiative recently added as part of a community project to enhance urban green spaces. The source of this information is local municipal planning and the involvement of neighborhood residents in the garden’s development. The beach is designed to provide a recreational area for the local community, similar to other urban beach projects seen elsewhere in the Netherlands.

Additional context about the location:
Although this beach is located in a residential area, it is part of a redevelopment project for urban greening and community bonding. The beach has been carefully created with sand, lounge chairs, and surrounding greenery to create a relaxing environment. It is intended as a place for neighborhood residents to relax, children to play, and community events to take place.

Additional information:
The specifications of the beach, including its location, are documented in municipal plans and neighborhood feedback. There are also flyers and information available in the area announcing and explaining this project. This indoor beach is a temporary (but potentially annual) project, which might explain the unusual characteristics you noticed.

I hope this provides enough clarity. Let me know if you have any further questions!