Paint-by-number kits were the rage when we were children growing up in the 50's. I can remember my mother painting several of them before finally painting on her own. As a child, I tried one, too, but the process was so slow that I blended the colors together instead of staying in the lines.
Several years ago, my husband's cousin asked if I'd like to have the paint-by-number picture that my husband had painted when he was about ten years old and given to his grandmother as a Christmas gift. His grandma had kept it hanging in her home since the late 50's. Now it's finally hanging in our bedroom, after receiving a much needed cleaning and varnishing.
Bob recalled painting it, mentioning that he remembered having to wait for the color to dry completely before painting in the next color. He said he was very careful to stay in the lines, too. He can still be patient like that today when I just want to hurry things up.
Unfortunately, there was a time when I made fun of paint-by-number art, but I really cherish this one, especially knowing that those ten year old hands lovingly painted it as a gift for his grandma. It even has the original frame, too.

"Leonardo's THE LAST SUPPER - PBN" Painted by Bobby Maudlin, oil on board, 31 x 14" COLLECTED