An attention sink is that which attracts and absorbs our attention.
In electrical engineering, there's a concept of an "Energy sink" which absorbs energy.
Scrolling infinite feeds of Slop on Traditional Social Media is one attention sink.
Hopefully WeWrite will be a less-bad attention sink, encouraging users to Create more than you consume and become active participants in the narrative, rather than being hypnotized by the scriptwriters
Every interactive piece is an attention sink
Big Stage and Small Stages are both types of attention sinks, where the audience's attention is focused to what's happening on stage