One thing that I didn’t bother mentioning in the original visual updates post is that the economy structures emit particles of various colors, which show their tech level at a glance.
This was already done previously, but in a much more boring way (visually). As you can see here, it is a very nice representation and combination of the colors. It’s worth noting that much care has been taking to make it so that the colors are not easily confused. It is still possible that the colors could be a little bit confusing at first, however in testing, any confusion (if there was any to begin with) was cleared up quite rapidly.