A sneaky flower dealer near Sunset and Vermont in Los Angeles has a sign on the sidewalk that tricks drivers into thinking it sells roses for $4 a dozen.
But if you get down on your hands and knees and use a magnifying glass, you can see a tiny "1/2" in front of the large "DOZ,"and an equally miniature "99" above the dot after the "$4."
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects