The glasses can actually pick up disagreeable scents that emanate from the wood and its resins.
Negative chi doesn't always enter your home or workspace via poison arrows, sometimes, people or objects emanate negative energy.
The cozy and comfortable atmosphere serves as the perfect venue for patrons seeking a place to relax and dine in the heated patio or indoors while nightly live jazz tunes emanate from the piano.
For a circle, when the rays emanate from any point, the secondary caustic is a limacon, and hence the primary caustic is the evolute of this curve.
When the refracting curve is a circle and the rays emanate from any point, the locus of the secondary caustic is a Cartesian oval, and the evolute of this curve is the required diacaustic. These curves appear to have been first discussed by Gergonne.