Cages.

[remio]

I like the new cages idea, I really like the fence idea but I like the slime blocks cage more because you can bounce around. Also they could make it to where the cage disappears, but you can always report players for canping in their cage

Yup, but they'll get a warning.
I think removing the cage is better.

 

[Carmenn]

It's a great idea, it's indeed a bit boring when you only see 1 color glass. But on the other hand, you're only there for a short time so it doesn't really matter.