Fragrant Arolla pine wall panels from Zirp in Austria emit a piney aroma that contains up to 0.5 percent pinosylvin, an antibacterial and fungicidal substance naturally present in the tree’s heartwood. The panel design creates three times more surface area than ordinary panels, maximizing the spread of a scent that scientists at the Human Research Institute say helps to lower heart rates and speed the recovery of people under physical and mental duress.