{
  "frens": [
    {"background": 9},
    {"background": 1},
    {"background": 11},
    {"background": 3},
    {"background": 7},
    {"background": 2},
    {"background": 10},
    {"background": 5}
  ],
  "why": "Two frens in each of the four background families (clean lab, messy lab, tube, wireframe) so the batch reads as one lab with varied rooms, opening on the molten Tube Yellow for fren 1 because it pops hardest against the green pepe, and within each family favoring the colour the collection has fewer of (Clean Lab Green 9, Clean Lab Red 10, Tube Green 12, Messy Lab Blue 14)."
}