There are eight scents now, and that number could be confusing if we don't explain the shape of it. It isn't eight of the same thing.
The two halves
Sunday Morning, First Light, Quiet Evening and Clean Slate are the candle-and-mist family or our STILL Moments variety. Each exists in both formats, in the same fragrance, so a room can be layered without anything clashing.
Atrium, Horizon, Parlour and Gallery are the diffusers or our STILL Spaces variety, and they exist only as diffusers.
Do they collide?
Mostly no, because they tend to occupy different rooms and different rhythms — a diffuser holding a hallway continuously, a candle lit in a lounge for an evening. Trouble only starts if you run two strong, unrelated scents in the same room at the same time, which is the same advice as for mixing a mist and a candle.
If you want them adjacent, the safest pairings share a note. Parlour and Quiet Evening both rest on sandalwood. Atrium and Clean Slate are both bright at the top. First Light and Horizon both go woody underneath. Not rules — just the paths of least resistance.
Choosing, briefly
If you want an occasion, buy a candle. If you want a room fixed in thirty seconds, buy a mist. If you want a space to smell like something without you thinking about it, buy a diffuser.
The Fragrance Finder on the site still covers the first two properly, and now suggests a diffuser to go with your result.