The Answer You've Been Waiting For: How Many Arms Does an Octopus Have?

"How many arms does an octopus have?"
"The answer is six: the other two are legs"
TimesOnline (August 13, 2008)

"A giant Pacific octopus called Mavis has helped researchers to prove that the one thing everyone knows about the creatures is wrong...."

"...Octopuses are among the most intelligent of marine creatures and can learn to open jam jars and manipulate small objects such as the Rubik’s Cube – although, so far as is known, none has yet succeeded in solving the puzzle...."

I wonder: has anyone checked, to see if octopuses see colors the same way we do?