Single people want relationships, settled people wonder if they're missing out on something, traveling types miss stability, stable ones are restless, old friends want new friends, new friends miss old friends... The doubt is natural, and everyone you know -- yes, even that person -- carries it sometimes too. Allow yourself to be peaceful. Allow yourself satisfaction in what you have. If you really don't like it, allow yourself permission to make changes.
Blue Trees by Konstantin Dimopoulos, is a social art action. He paints trees with a ‘biologically safe pigmented water’ to make a statement about how important trees are to our survival. The color fades in 2 months. Very cool.