Having done plenty of rebrands on my end – its always interesting to see what a brand has gone through to get to where they are today. Just came across this on DesignBoom’s website. The pattern seems to be that logos go from being intricate and detailed to very simplified and graphic which is, in my opinion, the goal that you need to have when designing a logo. Your clients need to recognize it at one glance. The fewer details/colours will make for fast identification and keep your brand fresh and sustainable.
Looks like I have another book to add to my library!