I came across this article by David Webster today about how to get your point across in lectures and make sure that the whole audience can grasp the points you are making.

One lecture absolutely stands out for me as an utterly life-changing, illuminating, revelatory experience for me in my university career. The lecture was given by Dr Gavin Kendall.  

It was the middle of a series of lectures on the history of psychology. The series had started with a spiel about how the ancient Greeks ruminated philosophically  about the nature of mind and perception, and then went straight to twentieth century behaviourists etc. Something about this had felt "off" but I couldn't put my finger on why, at the time.  

Gavin came in and delivered an amazing lecture on Foucault, and the history of madness, and how the notion of normal perception & cognition had been arrived at by first defining what was not normal, and showed us how the theory of mind had developed via Locke and the alienists of the 18th century. It was like a revelation.  

It was also well-illustrated (lots of 18th century engravings of mad people). It was probably also a well-structured lecture (too long ago now, don't remember).  

But I came out of that lecture reeling and dazzled and absolutely fizzing with ideas.