That 's brilliant Kewart. Developing an understanding of our senses and building a vocabulary is essential and so many of us have to wait until we're older to put that together (heck, I'm doing it now!). I'm jealous of your pupils for getting such a good start.
And I love the idea of a scent project for next term. They could look in their kitchens and see what smells they like and think up a perfume of their own. Especially good with all the Xmassy smells around.