John Topley penned this rumination on the Ford Ka when it went out of production. I thought you might like to take a look.
About the only point where I am not in agreement with John is what he refers to as the Ka’s discordant lines. What makes the shape work for me is that absolutely everything adds up to a strong unity. Amazingly, the alternative design was as wrong as the actual one is right.
What happened around this time in car design? If I can generalise, the main surfaces were still quite simple big spans as per the 80’s but the lines where they intersected became complex: both in their number and character. Today even a VW Polo has a pinching at the creases. Mazda, Mercedes, Alfa and Ford and many others use much more intricately constructed surfaces than we have seen generally. Turning back to the Ka, its dynamism is balanced by calm surfaces and orderly graphics. You can see a little of this in the CX.