The usual approach (to yarn bombing) is to sew the knitting on with a seam.
However it would be possible to knit a tube onto a bike stand without any seaming, if one were willing to actually sit there and do so (it'd take ages and be very uncomfortable).
I see your knitted bike racks, and raise you a carpeted zebra crossing (http://www.michael-grant.me.uk/images/ljtrivia/2007-Summer/originals/zebra_crossing.jpeg)!
Is it just me or are those not dangerous? They have much lower contrast with the road surface, so they'll be much less visible to motorists, and it wouldn't surprise me if some people with limited vision had more difficulty locating them.
Those have lasted well. According to Cambridge News, they've been around for a week or so. And it's not the first instance of guerilla knitting in Cambridge, either!
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However it would be possible to knit a tube onto a bike stand without any seaming, if one were willing to actually sit there and do so (it'd take ages and be very uncomfortable).
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(You may need to click through to the high-resolution image to see the patterning.)
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