I often find myself looking upwards whenever I travel (which is probably the reason why I am fixated with ceilings). In the absence of roofs, however, I do feel happy with fronds and branches. Want some proof?
Assisi, Italy. Olive trees that lead to the Church of San Damiano where St. Francis of Assisi received his calling of rebuilding the church.
Cordoba, Spain. Orange trees that dot the patio of the Mezquita-Catedral, the mosque-turned-Catholic in this former capital of the caliphate of Moslem Spain.
Beijing, China. Pine trees that lavishly decorate the Summer Palace.