abstract administration blank blue building contemporary glass green industry modern office panels pattern reflections repeated sleek slick stylish walls windows work workplace anonymous danger door escape estate factory fence fire industrial ladder metal perspective railings stair stairs unit wall warning window announcement backdrop background banner border copyspace display elegant frame graphic highlight light panel rectangle sign smooth tag texture ticket vector violet pink white beige brown sepia mushroom art supply canvas copy copy space fabric fill fill space gradient grain manuscript neutral overlay paper parchment poster stationery weave woven