I'd like to draw this as a TikZ:
\
\
+---+---+
| * | * |
+/--+---\
/ \
1 +---+---+
| * | * |
+/--+---\
/ \
2 +---+---+
| * | * |
+/--+---+
/
3
I've tried various things to make an "empty rectangle with a dividing line, to no avail. . . .
shapes.multipart
library