Every box says which one it is.
C4 is four pictures of one architecture at four distances, and its boxes look alike. Here each one carries its type above it — person, software system, container, component — so a reader knows what they are looking at without a legend.
Zoom in through the green dot.
The container level is a board under the system. Open Lantern Pre-order from its green dot and its containers are drawn inside its boundary — the mobile app, the order API and the orders database — with the customer and the till outside it, as they were one level up.
One system, on the context and inside the containers.
The box on the context board and the boundary on the container board are two figures of one object. Rename Lantern Pre-order on either and both say the new name; open it on the project page and both boards are listed, with the one under it.
Every figure, named.
The toolbar's own names — what you pick is what this list says: two groups, 13 figures.