The first part, Temps, is two linked charts stacked on top of each other. On top are individual articles and on bottom are tags that provide context to those articles. You'll probably be tempted to read the visualization as a stacked area chart, but that wouldn't quite work. Bar height doesn't really mean anything other than there were more articles or tags in a year when the bars are small. Instead, color indicates count. Roll over an article and see the related tags over time or vice verrsa.
It reminds me a lot of Bestiario's earlier Atlas of Electromagnetic Space.
Then there's Canvi, which is a network view of tags and links:
I'm not completely sure what I'm looking at with Canvi. It's more artistic expression than utility, I think. From the Bestiario blog:
The uniqueness of Canvi lays in the fact that it explores new node positioning techniques as well as their spatial relations. In particular Canvi combines different techniques (geometric paradigms) subtly alternating between nodes and their relation. This means that the representation of the network is in constant movement (a breathing sort of movement), this way offering a broader perception of the local network.
Yeah, I'm still not sure, but it's nice to look at. Ideas anyone?