Interesting. When I was a child, we lived in an old cottage with single-glazed windows and no central heating. In winter, we often had frost patterns of sycamor

Interesting. When I was a child, we lived in an old cottage with single-glazed windows and no central heating. In winter, we often had frost patterns of sycamore leaves on the windows. We had sycamore trees in the field across from the house, but I can remember being confused and wondering if someone was pressing the leaves to the window during the night.