This is an excellent truffle: A Periodic Table of Visualization Methods. Excellent source of inspiration. Some visualisations are known, some are inspiring (at least to me). Here are the categories:

  • Data visualisation
  • Information visualisation
  • concept visualisation
  • strategy visualisation
  • metaphor visualisation and
  • compound visualisation

And the whole thing looks like this:

But you should really click through to the table (made in Flash) itself, because for each of the squares, the visualisation is shown as a popup.