Here is a detail from a traditional, leaded light window for #FensterFreitag. I particularly like the way the sky and trees are reflected in kaleidoscope fashion by the diamond-shaped 'quarries', and the fact that each panel contains a split (presumably repaired) diamond. I've no idea how old this window is, but the building was dated 1420, and this was a dominant style of window making for much of the last 1,000 years.