I thought everything was black and white and grey in the old days. Cars, houses, streets, people, buildings, everything. It was always shades of grey. No color. At some point I started to understand that this had to do with technological limitations of filming. Still, it's deeply ingrained. I still imagine soldiers fighting each other in all the wars prior to Viet Nam as fighting enemies in various shades of grey, and people who made love prior to about 1950 doing it in shades of grey.
I don't know if I ever actually thought that way but the concept has always popped into my mind from time tk time.