When monochrome monitors were the standard, a file left on the screen for a long time could leave a ghostly pattern on the glass, burned in by the constant light needed to display the image.
That, after one early screening, the crowd broke out into a chorus of boos and jeers when the ECB president, Giles Clarke, popped up on screen for a final time at the end of the movie.
They're typically asked to write about some life-changing experience, and, if their childhood has been blessedly free of drama, they may find themselves staring at a blank screen for a long time.
His goal was to find a way to get them, he said, "to stay in front of the screen for a long time and just allow them to be there".
From Funny Face in the Fifties, via 1966's Who Are You, Polly Maggoo? to the more recent The Devil Wears Prada, the fashion world has been at home on the big screen for a long time.
After all this process, basically looking at the computer screen for a long time, then we can start digitizing it".
This is repeated until the destination is reached, upon which the user ends the guidance by pressing the smartphone screen for a long time.
Image caption Redford and Jane Fonda came together on screen for a fourth time in romantic drama Our Souls At Night (2017).
And when you've been staring at your screen for a long time, it can help you to better focus on the content, and not the controls.
We have worked with Damien Timmer and the team at Mammoth Screen for a long time now and this is the fourth drama we have made together for the BBC.
