When I’ve almost blundered into webs like that, it’s been an instant lesson in optics and how our eyes (don’t) work. I’m looking at the ground a few meters ahead - and somehow that hand-sized spider at 10 o’clock, 20cm away from my head, is invisible. Then there’s a dramatic whip zoom and I’m suddenly in my own little horror movie.
One time walking a couple of meters off the much-missed South Cross-Island Highway (scootering - alas, I never rode a bicycle across that)… I don’t know HOW I avoided walking through a web or getting a spider on me. Once my eyes were focusing at the right distance, I realized I was surrounded by spiders at all heights and angles, except the gap I’d just walked through. Of course, this realization was, er, mid-stream, leaving me with limited options for getting the heck out of there.