[Design] Dashboard and overlays

[Jeffrey Harris]

Hi Mimi,

Generally speaking, I like the direction your describing with overlays 
and helping users shift contexts in useful ways.

With that said, I'm curious what you think about the difference in 
behavior I perceive between overlays in the calendar and overlays in the 
Dashboard.  This is my understanding of how overlays will work in 
various areas:

- If I'm viewing my Home collection in the calendar and overlay my Work 
collection, that's an additive action, no events go away, I might get 
some new ones

- If I'm viewing my Dashboard (which always shows the summary view), the 
first collection I overlay is *subtractive*, no new items appear, many 
go away

- The second time I overlay a collection, it's additive to the first 
overlaid collection

I agree with your explanation of why this is a good workflow, so I think 
this is a reasonable path to follow.  But I worry people will be 
confused by what "overlaying" is doing.

Sincerely,
Jeffrey