Seljalandsfoss is one of the most popular and beautiful waterfalls in Iceland. In 2018, we arrived here just in time for the waterfall to be illuminated and enhanced by sunset light. In 2019, we arrived a few hours earlier; note the difference in color of the mountain behind the waterfall. In both instances as well as more recent visits, I find Seljalandsfoss to be truly an enchanting and evolving scene. Also, note that on windy days, there seems to be a competition between gravity (downward flows) and wind-blown (sideways and reverse upward) flows.