If you've never noticed this architectural feature then perhaps you ought to slow down, you're moving too fast.
Where in Castro Valley can this be found?
Leave your answer in the comments below.
Congratulations to Mary Jo Gillis and Nathan Parks who correctly identified last week's visual puzzle as the facade of the old Castro Valley Library.
Have photos that you'd like to feature? Send them to editor firstname.lastname@example.org and see if you can tease the Valley.
About this column: Every week or so, we'll test your knowledge of places and things in Castro Valley. To browse puzzles from past weeks visit our archives.