A proof-of concept prototype of an interface for the browsing of vector layers.
Layers are represented as stacked transparent slides. Each slide can be in one of three different position: on the leftmost layer, on the central one, or on the rightmost one. Only the first two stacks actually display their content, while the third one is used as a place to hold hidden layers. Layers can be dragged from each stack to the adjacent ones.
This type of interaction, similar to the behavior of an [accordion widget](http://en.wikipedia.org/wiki/Accordion_(GUI), should let users compare layers by both superimposition and justaxposition in a (hopefully) natural way, reminiscent of physical transparent slides. It should also play well with touch-enabled devices.
One possible shortcoming could be the inability to rearrange the order of layers. It could also be solvable by implementing a drag-to-reorder behavior.
