The reason why they want all shades up is because, airlines rely on passenger's vision of the whole outer aircraft. The only people who can see the engines and what happens in the surroundings, are their passengers. Crew who are seated at their crew seats, will not be able to see a whole lot of the plane's exterior. And obviously, planes do not have rear view or side view mirrors.
Thinking from a passenger's point of view, if you see something wrong going on outside, you would panic and call for the flight attendant immediately. Right? So that is how, flight crew would be alerted if anything goes wrong: by the passengers.
As for closing them at night, it differs with airlines. Most major airlines (SIA, MAS, Cathay pacific, Qantas) would still ask you to have it remain open, but they will turn off the cabin lights. (I actually don't know which airlines would ask you to close the shade as it is a safety procedure) Same thing, when you turn off the lights, you would be able to see the outside of the plane and report for anything that goes wrong.
Also, in any case of emergency, you will know not to go to the side with fire, or submerged into water by looking out the nearest window.
to make it possible view in case of emergency ,
Because you want full 360 degree vision available.
You definitely can find a wide variety of custom designed roller shades online. Your best bet would probably have to be http://www.theshadestore.com/landing/roller-solar. They have a wide variety and allow you to customize to your will.
WIndow shades are very useful at keeping your home cooler during the sumemr months and warmer in the winter.
It will be easier for the heat to spread into the school when the windows are open and shades are up because of radiation.
It's a trilogy: Fifty Shades of Grey, Fifty Shades Darker and Fifty Shades Freed
It depends what types of makeup shades you are looking for. There are 20 eyeshadow shades, 10 blush shades, foundation shades and 8 lip shades included in the kit.
Fifty Shades of Grey is a trilogy - three books. Fifty Shades of Grey Fifty Shades Darker Fifty Shades Freed
Erm, I am 13 and during the Summer of `o9 they were very popular, I own a pair of pink shutter shades but I am waiting till the Summer to see if they are still `fashionable`... :)
The second book is entitled Fifty Shades Darker. The third book is entitled Fifty Shades Freed.
There is about forty-eight shades of blue. I counted the shades of blue on the question " what are the names for the shades of blue colors?"