Visual software development through diagrams and other visualizations was a dream that persisted for a long time in IT, but never came true for any software platform. Yes it is true that UI design or database modelling can be very visual these days but the main bulk of any serious software project remains as of this day primarily text based. There are many reasons for that, but I don't want to discuss them here. Instead I want to express my opinion that despite the apparent lack of progress in this area, the visual expression of any abstract concept for most people makes it much more easier to grasp. So perhaps we should make more steps in that direction, even if we cannot turn the whole programming into a visual work yet.

I was playing the other day with some equations and thinking about how I was taught the logarithmic function back in school and how we usually think about it these days. And correct me if I am wrong but I can't remember a case when this concept was introduced in a some kind of visual way. The most visual thing I've ever seen about it was a graph of the logarithmic function – the well known curve. And may be you would say, this is because there is nothing visual about the logarithmic function per se. May be it is a purely mathematical concept, having nothing to do with visualizations.