Japan Sea
The association we make about blue for water and yellow-brown for land is utilized in this effective graphic to convey ocean depth and land height. The use of color is consistent with the message. The scale-key is appropriate and clear. The darker the color the higher the land or the deeper the sea, so the color values smoothly cross zero as white. The use of color value to communicate quantity is effective. The complentary colors emphasis differences, while the low color saturation and change of value reduces the vibration.

Source: Edward Tufte, Envisioning Informatoin

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