So how does one improve on perfection?

OK, so Lions’ Calvin Johnson is not exactly perfect, he’s pretty close.

That doesn’t mean the Pro Bowl wide receiver isn’t working hard to improve this offseason.

“There’s always room for growth,’’ Johnson said on Wednesday. “If you feel you’ve reached your point of where you don’t have anything to work for more any more ... Just myself I always know there’s something I can work on every year. That’s my motivation.’’

Johnson had a career season in 2011 with 1,681 receiving yards and 16 touchdowns.

Not perfection, but closer than anyone else.

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