Strewing might be what I did at the Live and Learn conference when I noticed that some of the leaves were turning colors and, as I was heading to our room, I picked some up off the ground and left them on the bathroom counter so that my daughter would happen to see them when she used the bathroom. I have no idea if she ever noticed them or not. Or it might be that I'm getting something out of a closet and I notice a game that hasn't been out and played in a while, so I set it out on the living room coffee table.
When the kids were little, I was very aware of and more intentional about this habit—I picked up interesting rocks or feathers, put out different kinds of paper or markers or tape or a puzzle or an old hat or anything that might, even if just for a moment, interest someone. Now it is just a way of life and I don't think about it, but we all do it. It is kind of a background thing that goes on in unschooling families—it is part of what creates a stimulating, enriched environment for our kids.
Image borrowed from the Five Crowns page