Why does the Windows 8 sign-in animation slide upward?

Raymond Chen

The early design for the animation that occurs when you sign in was to take your logon wallpaper and open it up like a curtain.

 
 
 
 
 

This worked well for nature photos.

However, it is very common for users to put pictures of people on their logon wallpaper. The likelihood of putting a person on your logon wallpaper is strongly correlated to whether you have children.[citation needed]

 
 
 
 
 

It turns out that people don’t react well when they see their children’s heads cut in half.

That’s why the sign-in animation is careful not to cut the picture into pieces.

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