The desirable qualities of a game

I've been reading "Man, Play and Games" by Roger Caillois and saw this list of the qualities of a game:

Caillois splits games into three partitions (or combinations of them): Agon (competition); Alea (chance); Mimicry (simulation); Ilinx (vertigo).

What I find interesting is that these were written in 1958 and they are still applicable. I have found the book good so far for analysing what and why people play online.

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It's All In The Game blog (c) 2005-16 by Jez Nicholson