Well, they can see through the vinyl strips; they're clear. My DH installed the last 2 strips late this afternoon, and it was a kick watching the girls decide how to get through them. They've been just sidling past the hanging strips, but now the opening was covered with them even though they could see inside the coop through the strips.
Half the chickens just pushed right past the strips and into the coop to settle down for the evening. The other 6 dilly-dallied outside, talking to themselves and discussing the obstruction. One hen sat at the top of the ramp, poked her head in and out, in and out, then pulled back to "talk" to her impatient sisters squished beneath her on the ramp.
Finally after about 10 minutes I picked her up and pushed her through, then the rest followed her inside.
I'll try to get a picture tomorrow morning as they barrel out through the hanging strips. Out's no problem... In may be a little problematical for another day or so. I might remove one strip so they are happier, then add it later in the weekend.