User blog comment:LivesByProxy/Proposed Vision Alterations/@comment-24385282-20160120185301/@comment-26815373-20160121045759

I think Teemo's "100% miss chance" should be the new effect, as it would effectively be a single-target pseudo-stealth, which in my mind, gives him loads of outplay potential. What you suggest about his Q 'blinding' his targets from any shrooms seems like a level of trolling only a Teemo could come up with. ;p

Srsly, though, Teemo needs some love. Riot, please.

As far as the use of overlays go, I think there is a lot of design space to explore. You mention. Well, consider that overlays do not have to be something quite so drastic as. Ahri's charm overlay could be as simple as applying a soft Gaussian blur over everything except your champion and - who would be highlighted in some way (similar to the way we see  reveal targets as red silhouettes with a little heartbeat). Not sure how I feel about s in general, though anything is possible with imagination. ;)

I think the use of overlays should be limited to what makes the most sense thematically (the strongest case for an ability). For example, I think that having an overlay would be better / more do-able / cooler than, though that's just me. In the case of the former, I can imagine that, while inside, everything outside it would be tinted Thresh's dark ghostly green color. Maybe it even has little floating around beyond The Box's walls. Note, I don't think Thresh's Box should limit vision like - the overlay can exist independent of vision reducing effects, being there largely as a bonus / QoL effect.

The list of abilities which *could* have some kind of overlay is pretty long. I even entertained the though of having an overlay that lets it act as 'a flash bang' turning your screen bright white if you step in it's radius. should be the first on the list though.

Also, not sure what to do about 'overlay overlap' - I honestly hadn't considered it. I would think that the newest one applied takes precedence over the others, but each expires according to its individual duration. IDK though. u.u