Danger
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Your entire post makes a lot of sense, Dave... and you have no idea how much it irritates me to acknowledge that fact.DaveC426913 said:I think you're making assumptions about bird behaviour. It may be plausible, but I'm not entirely convinced that the only effect of the ribbon is to act like as a barrier to flight even a symbolic one.
An alternate hypothesis: when one (human and bird alike) looks at anything, one sees objects and automatically brings them into focus. If those objects are two dozen yards away, that's where one focuses, which will have a tendency to blind one to something one dozen yards away if it's virtually invisible.
Possibly the purpose of the ribbon is to draw one's attention to the plane of the window instead of focusing on whatever is a dozen yards behind the window.
They do put big X's on glass doors in buildings for people. They're not to make you walk around them, they're to draw your attention to the fact that there's a plate of glass there.
On a more serious note, I'm not making assumptions about avian behaviour; rather, I am referencing past experience in a heavily bird-laden environment and combining that with stuff that I've read in SciAm. That, to me, means that my approach is an educated guess as opposed to a supposition. While I could very well be way wrong, I did at least put some effort into my opinion.
As an amusing (or maybe not) side-note, I'm very well aware of the hazard that glass doors present. During my 17-year sentence as owner and sole employee of Lock Ness Security, preventative measures against injury were part of my educational talks. We didn't use large X's, since aesthetic concerns were paramount in the opinions of many clients. Strategically placed tape, however, was encouraged.

