What @TonyM said. Just store colors in a field as space separated, like:
"red black brown". List and enlist can separate them out just fine.
```
<$list filter="[list[Cardinal!!colour]]" />
<$list filter="[enlist{Cardinal!!colour}]" />
```
both output
```
red
black
brown
```
Values with a space are handled with brackets. e.g. `yellow brown [[sky
blue]]`
You can also search that color field with `[contains:colour[brown]]` for
all tiddlers with brown as one of its list items.
You can collect all the colors of all North American birds with `[tag[North
American]each:list-item[colour]]`
One last thing. Don't use the field color. It's reserved by tiddlywiki for
stuff, and you'll get a color wheel as an input field.
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