Your question is a bit confusing. Slide 1.2 has icons that seem to appear via the timeline and the fish example looks to be clickable to show the fish layer.
Assuming you had hidden icons and wanted them to appear after a layer has been visited, you don't probably need variables.
Set the initial state of the icon hidden
On the layer, create a trigger to change the state of the icon to normal when the user (clicks the X).
If you want to provide more detail on what you're doing, then you can get more explicit instructions.
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Your question is a bit confusing. Slide 1.2 has icons that seem to appear via the timeline and the fish example looks to be clickable to show the fish layer.
Assuming you had hidden icons and wanted them to appear after a layer has been visited, you don't probably need variables.
If you want to provide more detail on what you're doing, then you can get more explicit instructions.
Hope that helps.