Image 1 Caption: "A logarithmic map of the observable universe with some of the known notable astronomical objects. From left to right, the astronomical objects are arranged according to their proximity to the Earth. Near the left border, the Earth and near-Earth objects are depicted. Near the right, the most distant observed objects are depicted. The astronomical objects appear with enlarged size to appreciate their shape." (Somewhat edited.)
Features:
The horizontal axis is right ascension where each hour is 15 degrees. The whole right ascension axis is shown from -6 hours to 6 hours with the scale increasing to the left.
The declinations or some fraction (or varying fraction) of them are just conflated I think. The ecliptic is certainly included since the Moon, Sun, and planets appear.
The vertical scale is logarthmic in various appropriate units. The objects are located at one point in time---a point I do NOT know---but circa year 2005.