Share price movements are kind-of-sort-of-rational but not always intuitive. For example, when Apple has a big keynote and announces some significant product, everyone expresses surprise that the share price goes down straight afterwards. Even many smart people get this wrong (“It isn’t based on logic and reason” – The Talk Show episode 53). I hope to explain why the price dropping actually does make sense in this post.

In doing so I’ll likely make some errors. Some of those will be deliberate simplifications. In other cases I’ll probably just be wrong. But either way, I think the gist, if not the details, should give you a good idea of what’s going on.

This weeks PhotoFriday theme is “Patterns.” My entry was taken last year in the London Transport Museum.

Please also vote for my entry in last weeks challenge, “Red.” I’m entry number 43.

This weeks PhotoFriday theme is “Red.” My entry is a Ferrari because what other colour are you going to one in? (Actually, I didn’t drive this one. The one I did drive was a front-engined GT and it was… white.)

Incidentally, this isn’t the first time “Red” has been the PhotoFriday challenge. Last time I used a picture from Cuba.

This weeks PhotoFriday challenge is “Flowers.” This entry was taken in Cannizzaro Park in Wimbledon.

I never know whether to put blogs about Apple stuff here or on my company website. This time I wrote a few thoughts about the best bits announced at last weeks WWDC keynote (mostly stuff arriving in the Autumn) and put them over on the Wandle Software blog.

This weeks PhotoFriday theme is “Road Trip!” Here is my entry. This was taken on a journey from the the Bay Area to Tahoe.

For this weeks PhotoFriday, “Beach,” I went all the way back to my first visit to San Francisco, with this image of Baker Beach. You can see the famous Bay Area fog and — if you expect all of California to be as warm as LA — lots of overdressed people.

Please vote for my entry in last weeks challenge, “Reflections.” I’m entry number 81.

This weeks PhotoFriday theme is “Reflections.” My entry is a reflection of a building in London.

I don’t post an entry for last weeks challenge, so there’s no need to vote for me. (There are still some good ones!)

I went through quite a few thoughts and pictures before I settled on this one for the PhotoFriday theme “Orange.” I went clever-but-not-in-the-spirit picture of a wind-farm in Orange county, then obvious photographs of oranges or orange sweets. But I finally went for this rust on a canon in Rhodes.

Please also vote for my entry in last weeks challenge, “Wet.” I’m entry number 64.

It’s easy to forget how much computers have changed over a relatively short. time. A book I found in my old room at my parent house, “Simpleton Explores Microcomputers,” helped me get some perspective.

I don’t know exactly when it’s from, but it’s certainly early eighties. Possibly 1983 or 1984.

It explores the computers that are available at the time and what it’s like to own one. One of the most telling aspects is that it’s written for people who have never owned, possibly used, a computer.