People like wood as it gives a feeling of warmth and softness. Wood is easy to work with, and this makes it a wonderful material for most every case. Instruments, furniture and of course walls are made from dead trees. Wood becomes used quickly. Aged wood shows a lot of marks of those who passed by over time, and it's a pleasure to look at. At least when you spend some time and money to keep the surface nice and tidy.
Limit #3 Staircase on a budget
If construction's on a budget, every single piece of wood becomes a factor. And if the carpenter goes haywire, he's not wasting a single bit of cheapboard. Even a mundane staircase can become a piece of art Mondrian would be proud of when smaller pieces are glued together to save on construction cost.