<a href="http://www.flickr.com/photos/hortonhea...

This sol 72 amination of image 3 in reply 72 is puzzling?

Er, Winston, Brian, which substrate was this?

It looks like a magnetic substrate because of the grain clumping -- but I'm not yet "up to speed" on decoding wheel position and substrate.

Originally I thought this was "just" a focus sequence -- but the sample wheel was moved also ( had to do a scaled rotation registration ), so maybe just the operation of the sample wheel actuator was enough to cause the larger partcles to move.

Vibration? Magnetic forces? Er, the whos are having a party?

Any speculation about what the planned observation was?

Notice that in the first 3 minutes the movement was toward the ( magbetic? ) center, followed by a downward movent of only the larger particles.

I sure would like to know what's going on here.