They’ve got to the contrary stage, being big enough to get some attitude. Several are climbing up the stick in readiness of creating their chrysalis on the roof of the caterpillar castle.
The others will follow suit in the next day or two.
When I have them in a caterpillar castle, I place a stick in the centre of the plants, to give them something to climb up to the roof where they will make their button and hang in a 'J' shape prior to forming their chrysalis. The system works well.