chair chairs class classroom desk desks education learn school study educations empty spring break fans glass monitors office open space wall walls windows backboard board greenboard write animal bird brown cutout fence isolated pigeon plank planks pot rest sit white book books bookshelf bookshelves borrow educate lent lesen library quiet read silence student students university warsaw appearance background classroom-furniture display displayed educational furniture historic history image old past polished seats wood wooden child children color coloured design graphic home house pencil play primary depth of field keyboard technology work 3D abstract person Rendered simple