Super nice and colourful poster by the Danish designer and architect, Knud V. Engelhardt.
The poster here has the name "Trams of Copenhagen E3", and has the number "3" in the foreground.
The black "3" breaks the lovely, simple and white background.
The poster can be purchased with or without a frame, available in different varieties and colours.
These varieties and colours are black wood, natural oak, dark oak and magnetic oak frame.