Quote: Original post by guy_with_a_pexel
I'm not sure the deaper reason for it, but it's just what people associate as being good versus bad. If you ever watch stain removal comercials, you will always see the good stain removal on the left, never the right. Same with before and after photos.
Actually, at least in the US, it tends to be the other way around. The left side is the deprecated side, while the right side is the emphasized side. The reasoning is simple: we read from left to right in the US, so we tend to scan scene changes on television from left to right and spend longer looking at the right half than the left. Bounty (paper napkins) is always on the right. Ditto Always (menstrual pads and pantyliners).
It's by no means universal though. Because of the conventions of visual drama, positions oscillate (but I can't verify whether entrances do).
Interesting.