When I arrived in the Netherlands more than 30 years ago the concept of insulating double or even triple layer glass was basically unknown. A lot of the old mansions along the grachtengordel in Amsterdam still have windows with glass which is centuries old. These glass panes were not flat and had variations in thickness. Consequently the reflextions have bizarre distortions. In the last years heat insulation has become increasingly important and regardless the immense costs the old window panes are rapidly disappearing.
Toll!