As a space fills up, ideas about the same topic end up scattered. You can draw a boundary around them yourself — and, separately, the space is already grouping itself from the words your cards share.

In this clip

• Selecting cards that belong together and grouping them
• Naming a group, so its theme is legible to whoever arrives next
• Collapsing a group to hide its detail, and opening it again
• Semantic clusters — regions that form automatically from shared words
• Reading a cluster’s label, its members, and the band showing what card types it holds
• Inspecting a cluster like any other set, or focusing to work inside it

Try it: Look at what the automatic clusters have picked out in your space. Do they match the groups you’d have drawn — and is the difference telling you something?