This series of window lettering snapshots in La Rochelle, France, is focused solely on the Bauhaus-inspired geometric sans serifs from the late 1960s and 1970s. (See True Type of the Bauhaus for typefaces that were actually used at the Bauhaus.)
I had this idea after seeing two neighboring signs: one about podiatry and the other about a beauty salon. What interested me was to see the various uses of that genre. In these examples, only two colours are used: white and blue. When the colour is white, the font is combined with a dark background and the sign is about something that deals with food. When the colour is blue, the background is white and the sign is about something that deals with health (podiatry, beauty salon and water recycling).