Ripening rainbow

These funny little tomatoes are from a bush my daughter has been looking after all Summer. All these ones she picked while still green, because the branches were getting too heavy for the plant. They had all sat there on the windowsill for a couple of weeks at least and we wondered if they would ever change colour! Yesterday I noticed that by chance they had started changing in exact order, according to their position in the row. I thought it looked cool, so I took a few photos.