Because otherwise they would be unable to track movement and move the cursor in the computer screen.
In case he got a hole in one.
M-my parents " "No! A bowling ball! I'm so sorry..."
The tracks were unfinished.
All seven or eight of them.
Try picking them up !
Because he footman turned into a mouse.
His vision was based on movements.
Because your foot would go right through the computer screen!
He wanted to check his e-mail.