a hole in the ocean

ok, it’s really on the shore, but it’s pretty darn close to have water pouring into it all ’round!

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apparent motion

 

from the comments on the facebook post, some people couldn’t see the apparent motion in this figure and some people could start and stop the apparent motion.  once i read that, i learned that i could stop the motion, too, but then it got harder to start it back up… what’s YOUR experience?  anyone know why i checked “math” as one of the categories?