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From tek@evilsuperbrain.com:
I have a couple of technical problems with this image:

1/ it doesn't look like blur, there's only 5 "samples" and they're spread out
too far. Really you want enough samples so that they're only a couple of pixels
apart to get that smooth blurry look.

2/ The problem with using transparent 3D objects is that it doesn't look right,
there's some bits of the image where 2 copies of the wheel pass through each
other and you see a hard line where they meet, also its possible to see inside
solid objects if they become transparent (e.g. you can see through the rim and
see the spoke that's inside it). True motion blur happens inside the camera/eye
as a strictly 2D effect, i.e. render lots of images then blend them together.
Of course this breaks the IRTC rules unless you use a renderer that does this
internally, I recommend Megapov for that.

Also your objects fade from opaque to transparent, when in reality each image is
exposed for an equal period of time and shouldn't be any more/less visible than
any other.

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From zekaric@yahoo.ca:
Somewhat difficult to enjoy as the idea of a car's wheel is somewhat lost in the
business.

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From BigTrav2001@chartermi.net:

Very nicely done. I like how it becomes abstract art, like a modern version of
Duchamp's "Nude Descending a Staircase." Seriously. Cool.
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From p.gibellini@teinos.com:
Rolling friction.. Nice textures and light.

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From glenn@mccarters.net:
Ouch, this kind of hurts my eyes to look at.  It looks somehow "glassy" =
or "watery" rather than "speedy".