These are very clever, Frank.
At Arromanches, where the Mulberry harbour is, they have a wrap round cinema high up on the cliff, where you go inside and watch a moving version of this idea.
An old black and white film taken from a tank driving down a Normandy High Street, rubble, destruction, loads of women throwing flowers....then suddenly the film changes to modern colour and you're continuing the exact same journey in the modern day, and there's a street market and people sitting outside enjoying a coffee.
I think it was one of the first applications of the all round camera that nowadays does the google street map thingummy. Amazing.