what color are they?
Curtains were green. If I see brown or green (or many other colors) in isolation, I often have trouble identifying it. It it’s in close proximity to the complementary color, I can often discern the proper colors. I used to have to sneak up slowly on rural intersections in small towns in Oklahoma at night as I had to determine what location on the light bar the flashing light was - as I couldn’t tell if it was yellow or red.