Steer kids toward listing number of faces, edges, vertices, if they don't suggest those themselves. Re-record this as a table . The table forces common language and definitions.

Put that grouping to the side and ask for a structure that is different from this group.

How is this different from these?

Repeat the above process until all of the objects are grouped and the table is complete. Direct students' attention to the completed table.

Look at the table for anything you might notice about it. Take three/five minutes and write all of the things you notice in your notebook. Are there any patterns or interesting relationships? What questions do you have about what we've written here?

At the end of the specified time, say,

Take five/ten minutes to share with your group about what you noticed or wondered about.