In 2018 I have used the artistic scholarship of the city of Warsaw to develop my own technique of making „stained glass” from recycled plastic. Then I have created windows for openings in an old, hollow willow tree, that some people from the district were considering cutting down as an useless trunk. I have created the Willow Temple, open for everyone. Colors are dancing inside on a sunny day. I have also installed a small solar battery on the top of the tree, so that it gets lit from inside during the first hours of the night.