Filtering functionality

[rossmoody]

Could be fun to institute filtering functionality of some kind by:

• Size
• Color
• Animation
• Viewbox
• Hidden

This is an interesting question in particular because if filtering was instituted in this way it would free up a lot of card space. For instance, if cards were filtered by whether or not they are in view then it is implied by one global switch as opposed to individual notation on each card. This actually seems like a better usability approach in general.