For visualizing how the ActivityPub protocol works, nostr:npub1mrhlmhmv9k4rj036h9e45stq4jvclvz85xxa2hnadeql854257jqc9t4w0 uses playing-card like physical objects he designed for this purpose: https://digitalcourage.social/@sl007/110728365658128395
You can download them here: https://github.com/sebilasse/activitypub-origami
#ActivityPubOrigami