SUMMARY – the human visual system is sensitive to lateral movement across the background… but we are particularly poor at spotting things moving directly towards us… this is known as ‘motion camouflage’… motorcycles approaching a driver waiting to turn may not create any lateral movement… and the driver fails to spot the bike due to motion camouflage…
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Photo credit Paul Townsend https://www.flickr.com/photos/brizzlebornandbred/20001313491