Desktop Windtunnel

I am not sure why I made this. Just a bit of fun during lockdown and to satisfy my natural curiosity!
It's an opportunity to try to photograph some cool images of airflow in different situations. I am not expecting to make any new discoveries!
I have already found that the slo-mo feature on my smart phone takes interesting shots of the smoke but the best pictures are stills taken with 1/4 or 1/2 second exposures. In these pictures the smoke trails are smoothed into lines which are clearer to see.