@Diego Mesa,
that's a great idea! I'm very interested in that, do you realize this in wikitext?
@all,
I've made macro to reveal content based on the tiddler's width in pixel using the formula plugin. I'm making another one for the tiddler height and a third one where tiddler height and width stays the same but mouse scrolling on tiddlers lets you change the transcluded content. This plugin is a new game!
Simon