I want to get a half convex lens (thick in the middle, flat on one side). And coat it in thermally and optically reactive transition filters. They are to be segmented so to reduce spread of filtering. This will give a view of the sky with any bright light inhibited at the focus. Next to the focus, an adjustable polarising filter. This will change the temperature of light that can pass. Below that is a deep concave mirror which has a focus point very close aligned with the focus of the concave mirror. Within the concave volume (that it partially encloses) we seat an object that we wish to cool.