It was the week the National Curriculum called “museum visit”. The teacher could plan the trip but this was the week because next week was another test. The children logged on. Some had customised their headsets with stickers but the teacher looked out across a class uniformly lining up waiting to be let in. She’d done the worksheet game. She or on her own headset and opened the door. “Oh not again,” she thought as she saw the exhibits had gone. The real-time sensitivity algorithm had deleted her main teaching point. She pulled up the worksheet and began to edit.