I couldn't help but see shadows when I was walking between two buildings.
One was the standard uninteresting type made of brick but the second one was full of ivy crawling its way upwards almost taking it over completely. Once I passed between the two a big tree appeared to cover the second building and the resulting shadow is this.
All of this nature is doing their part and not just in the shadows either. Sun, shade and oxygen are a few we all benefit from.
Please read over the initiative and start hunting for your shadows. They're everywhere!