In spirit of St. Patrick's Day, where in San Lorenzo can you spot this shamrock?
Post your guesses in the comments section below.
Guess correctly and be crowned "San Lorenzo know-it-all" for the week.
Congratulations to D. Hamilton for correctly guessing. The thingamajig can be found on the side of near Ashland Avenue. Keith Barros mentioned "I believe it is or was the exhaust mechanism to pull out the sawdust from the woodworking machines inside San Lorenzo High's wood shop."
Have your own photos around town that you'd like featured in our Castro Valley photo challenge? Send them to firstname.lastname@example.org and see if you can stump our readers!