During my short stay in California, I found quite a few nice features which I like to share with everyone.
The most impressive feature is the high ceiling, which I think is about 10 feet/ 305 cm high. The dark brown door in photo below is the main entrance, the plain white door at the far right is the garage door which is about the same height as the normal door we have here. Compare the gap between the doors and the ceiling and you can see the difference.
The next feature I like is the smooth/round edges for all the walls. This would certainly be more child friendly than the sharp ones we have here.
I also found they all have a big tray under the washing machine in the laundry, similar to this one. This would protect the floor from been damaged.
There's also wallpapers been applied in some of the rooms. And as below, the light switches were beautifully covered with the wallpaper.
The switch at the far right has some sort of built-in sensor, which probably would turn on the light when it detects any movement. This certainly looks better than a separate sensor been installed on the ceiling corner and less wiring required.