You can still order a poster of this cover today at allposters.com.
This is what it says in the "This Week's Cover" section of this issue of the Saturday Evening Post:
"This cover landed John Falter in his second childhood. A man can't paint kites unless he flies a few, can he? Falter bought some Navy target-gunnery jobs - double-string rudder-control affairs like the red and blue ones in the picture - and Mrs. Falter became a kite widow. Then Falter and friend Arthur Naul built an eight-foot box contraption. The leviathan flew too. Until eventually it crashed, and now it will never fly again. As time went on, people got to inquiring whether those old guys always out there playing with the kites were balmy or what. Finally, when the Post phoned Falter and asked him where under the sun his kite painting was, he sadly wrenched himself back into his vale of labor, and started painting, fast."
(Thanks to Gary Resnick for this information)