Showing and hiding a layer by clicking on the same image

Hi,

I can't seem to figure out how to show and then hide a layer by clicking on the same image.  What I want is the slide to function like this:

Base layer: Click on "object1" to show "layer1"

Layer1: Click on "object1" (which is on the base layer) to hide "layer1" (i.e. "this layer")

A work around that I've figured out is to copy "object1" on to "layer1". But I imagine there is a more parsimonious way to do this.

Any help?

Thanks,

Aaron

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