The topic momentum challenged me. I thought of the time of year and nature. I have lived in the desert most of my life and spend a lot of time outside exploring. The wind blows regularly and we see many tumbleweeds rolling their way across the desert. They are very light and prickly and tend to float in the wind. Sometimes when there is a strong windstorm at night they will all be piled up next to a fence all stuck together, piled high like a pyramid.