<p><strong style="font-family: 'Open Sans', sans-serif; line-height: 19px;">Fig. 3-15:</strong><span style="color: rgb(59, 59, 59); font-family: 'Open Sans', sans-serif; line-height: 19px;">&nbsp;Rulers stuck together.</span></p>

Fig. 3-15: Rulers stuck together.

Photo by Byron Inouye