NOTE - to my surprise BackWall also requires Felix'
TopStoryView plugin!
TopStoryView ensures that clicking on a tiddler link scrolls the tiddler to the top of the screen. This is not actually default behavior in TW. I have this plugin included as part of my default empty setup for tiddlyspots, so I didn't even think of it when making BackWall - but in some experimenting I notice it is needed or clicking a link in the sidebar doesn't scroll!
Anybody understands why? I suspect the position:fixed background image (which I think actually stacks all images like deck of cards at TW top) so default TW interprets this as if the tiddler itself is already in that position - no need to scroll.
<:-)