In Japan, June is the rainy season. It lasts over about a month. During this season, you may see these dolls made of white paper or cloth dangling near windows of houses.
It looks a bit scary, but it's not a ghost. It's a doll called Teruteru-bozu( Teru means sunny and bozu means a boy), and people dangle it to pray for a sunny day.
It is said that this costom started in the Edo period( the 17th to the 19 century) and that in some areas to dangle it upside-down or to draw face on the doll bring a rainny day.
It's easy to make it. Just make a small ball of paper and enfold it with another paper. That's it.
If you have a plan for going on a picnic or camping, why don't you try to make a Teruteru-bozu?