A/N: I had a few ideas for this chapter bumping around in my brain when my mother mentioned that the reasons airports switch from tile to carpet at the terminal/gates are purely psychological...

Psychology

"Sulu, I need something non-poisonous, non-toxic, non-pollinating, non-man-eating and non-transitory. And I'd like it to be tall."

Sulu's eyes bugged in surprise. "Any other criteria, Doctor?"

McCoy considered for a moment. "And quiet. I know you've got a Banshee Bark hiding in hydroponics."

Sulu crossed his arms and ran ideas through his mind. "You might be better off with a fake," he said honestly.

The doctor sighed. "Is all that really too much?"

"It might help if I knew where it was going, because different plants need different environments; I'm not going to give Mr. Spock, for example, an Andorian glass-fern to keep in his quarters. Maybe a cactus."

McCoy grinned at the image, his mood picking up. "Fair point. It's going in Sickbay."

"Sickbay?" He furrowed his brow. "Forgive me for asking, but, why?"

The doctor shifted. "It needs some greenery. Just in the main ward."

Sulu stared at him, not quite daring to speak what was on his mind.

"Fine. It's Feng Shui," McCoy admitted heatedly, metaphorical feathers ruffled. "Why do you think I have the lights able to dim in different colors, or the noise of the klaxon removed? Sickbay's for healing patients and folks coming in because they're ill, injured, or in need of an injection. I need to keep everyone that walks through those doors calm."

The light went on in Sulu's head. "Ohhh, why didn't you just say so?"

McCoy glanced around. "I'm a doctor, not an interior decorator," he whispered. "Chapel's been vetoing a lot of my ideas. My collection of unique skulls? Has to be hidden in my office. A display of antique medical instruments? Too frightening, has to be taken down." He rubbed his throat. "And too accessible," he added as an afterthought.

"But we need something and I'm about out of ideas."

Sulu considered. "Let me see where exactly we could put up something, and I'll get back to you."

"Bones, I received a requisition form about bolting something in Sickbay?"

"Yes, Captain."

"What exactly is it?"

"Bamboo, sir."

"You're bolting bamboo to the floor?"

"No, we're bolting a pot to the floor. Bamboo is in the pot."

"Why?"

"Because the only other option Sulu could come up with that fit most of my standards was the Banshee Bark."

"I don't mean why bamboo, I mean why… bamboo… in Sickbay?"

"It's good for the psyche."

"Seriously?"

"Need I remind you who the doctor is, here?"

…"Your bamboo is approved."