Switzerland canton (state) of Z羹rich; shore of the Lake of Z羹rich at Z羹rich-Enge: when the water is calm and free of algae the shallows appear as light blots - remains of a once contiguous off-shore bank that was ravaged in the past by exploiting it for building materials. On this bank the pile dwellers had built their settlements. The zigzagging black lines on the blotches are the ramins of fish traps.