A special-effects entrepreneur from Alabama has come up with a way to fill the sky with foamy clouds as big as 4 feet across and shaped like corporate logos — Flogos, as he calls them.

Audio slideshow A special-effects entrepreneur from Alabama has come up with a way to fill the sky with foamy clouds as big as 4 feet across and shaped like corporate logos - Flogos, as he calls them.

I would like to know why, when people look at clouds, they see shapes? asks reader Lauren Teneriello. In William Shakespeare's play "Hamlet," Prince Hamlet and Polonius chat about a passing cloud.