A woman enters a mechanic shop and asks the clerk for a 710 cap.
The clerk is surprised and goes to the warehouse clerk and asks him about a 710 cap.He doesn't know either so he calls a mechanic over and asks him about a 710 cap, but nobody has heard of a 710 cap.
The woman insists and says it is a part that goes on her motor and that it had mysteriously disappeared. She needed to find a new 710 cap. Considering nobody knew anything about a 710 cap, the clerk asked the woman if she could draw this 710 cap.
The woman, who incidentally had taken some drawing classes, didn't have a problem with this, being she remembered what the 710 cap looked like. She took a piece of paper and a pencil and drew a circle about 8 cm in diameter and wrote in the center the number 710.
This is what she drew.