Public parks are included in public green open spaces. City blocks alternated with parks and other open spaces. There are other smaller exhibition spaces. Often these events were parties at locations including clubs or outdoor public spaces. Cooperation between coworking spaces and academic environments are focused. Fire extinguishers are sometimes a target of vandalism in schools and other open spaces. The university campus is characterized by its grassy open spaces and tree cover. Skyscrapers may host offices, hotels, residential spaces, and retail spaces. Claustrophobia is the fear of confined spaces. Matrices allow explicit manipulation of finite-dimensional vector spaces and linear maps. Taipei maintains an extensive system of parks, green spaces, and nature preserves. The Binnenrotte is one of the largest open spaces in the centre of Rotterdam. It's fast rock with no empty spaces. This allowed omitting spaces between tokens for brevity or including spaces within identifiers for clarity. Curbs present an obstacle for accessibility to physically disabled persons in public spaces.