Marcella,
as I have just commented to another teacher:
We often don’t think that the Sun moves that quickly, since it takes a whole daytime to go from the east to the west, but in the time it takes to draw two people’s shadows, the first person can’t fit back into their own shadow!
We did this in a summer course a few years ago, and it was remarkable to see the teachers who hadn’t tried this before react to their changed shadows.
In the Sun and Shadows toolkit you can see how this understanding can be used to make a sundial, and the video we created during lockdown shows Frances running outside to make a sundial in her garden.