Light at night

Today my inharitage tax form has gotten  the first priority.
I promised to me, that I would go outside for a play with burning steel wool, when I would have finished the tax. Funny enough my son M. had to finish an essay, so the deal was to got outside after work. 
A little reward has to be :-)
So it was very late when we started, but that didn't cut down our fun.
We tried a large number of crazy things to learn, how the burning steel wool is acting. It was such a fun.
We left after 2:00 am frozen to the bones, but happy!
Thanks M. for your crazy ideas.
That was the first, but surely not the last attempt :-D