Kai climbed onto a box.
We were stunned. There was no sign that he could do this or had even tried before. Then suddenly he's up, trying to reach things he had no right to reach.
Prior to this we just worried about everything he could reach from standing height. Suddenly we had to double the height of the Green Zone, relocating pens, staplers and flick-knives to higher shelves and, failing that, attaching them to light fittings. It had to be done.