Shown above, Levelus spirit level perfume, from Art. Lebedev Studio:
This spirit level, which is also a bottle of perfume, is something an elegant carpenter could never do without.
Levelus is a fresh scent to highlight your love of life and self-confidence. The fragrance opens with a bright chord: Calabriane bergamot, rosemary and clementine oil. The optimistic wood notes of birch, cedar and vetiver are balanced with gentle iris root and cardamom.
The bottle is designed for an emotional, strong and self-confident man who doesn’t waste his time.
For frequent use, there are replacement perfume containers. Levelus comes in 20, 40 and 60 mL bottles.
The copy further notes that "Just sitting on your shelf, it still works, indicating whether the surface is level" — perfect! I am not sure if this is just a conceptual art piece or if the product is actually for sale. Whatever it is, I want one. (via artlebedev, with many thanks to Jan for the link)
Update: many thanks to Bela, who noticed that the release date on this product was 4/1. So, probably an excellent April Fools joke, but I still say it has a potential market! Just look at how many people here want one.