Recursive Functions by JMC

I've just read an excellent paper by John McCarthy. I believe I read it before, but it was so long ago, that I consider it to be read in a different life. When I look at the paper now I am amazed with the style of writing. John creates entire computational notation system, explaining it, giving examples and discussing why is it a good thing to do it his way. The topic/task is not trivial or simple, but John is able to do it in a way that not only allowed an average person to read it, but also paper is full of energy - it motivates for further thoughts and further readings. It is a truly a remarkable work.