This was in Goblet of Fire, when Sirius Black organises with Harry to “meet” in the Gryffindor Common Room…
Having a little play with some paper, I managed to replicate this easy DIY, that I’ve not seen any recreate (probably because they aren’t as mad as I am ha ha)…
Link to the printable can be found in the YouTube Video description.
Click “watch on YouTube” 👆