He did raise an eyebrow at that. He rather liked brown. It was a good, neutral color and pleasantly earthy. But he wasn't about to go breaking script to defend a color.

"Wrench. It's the most difficult tool to improvise. A hammer or a screwdriver may be used more often, but there are plenty of substitutes that would serve the same function in a dire situation. The wrench only serves one function, but it is the only thing that can serve that function and that specificity makes it vital."

There was a pause while he gauged Tachibana's reaction. He'd had a hard time deciding between screwdriver and wrench. There may not be wrong answers, but there are certainly wrong arguments.