Exploratorium at the Civic Center , SF

I'm going to call this "Ninja Walk" since I saw no title.

Attempt to walk silently across the gravel as a digital monitor tracks your cumulative acoustic output! Too loud and you FAIL - the SHAME!!!

of course, I can only imagine since I succeeded.

(But I have the advantage of growing up on a dirt road with very strict parents.. :)

DSC_1508

Done