do we all see colours differently? like if we all call grass green, your green would look like my brown, but we

Question: do we all see colours differently? like if we all call grass green, your green would look like my brown, but we wouldn't realise it, because we all still call it green. so because it is from our perspective, we don't realise it. is this possible?
- Keywords:
  colour,
  eye,
  green,
  sense,
  sight
Asked by listt002 to Mike, Pip, Tianfu, Tim, Tom on 28 Jun 2012. This question was also asked by kingers7.
- Tom Lister answered on 28 Jun 2012:
  
  I think about this a lot. There is really no way of knowing. I have a friend who is red-green colour-blind, but he’s no help. Even though I know he sees colours differently, he still describes them in the same way. He usually know the difference between red and green, but he says that both are very dull colours to him.
- Tim Stephens answered on 28 Jun 2012:
  
  I don’t know how we’d be able to tell, but I’ve often wondered the same thing too.
  
  I’ve got a friend who’s red/green colour-blind too. He tells me that he can see something of red or green when they’re separate, but he’d struggle to pick a red sweet out in a jar of green ones…

Question: do we all see colours differently? like if we all call grass green, your green would look like my brown, but we wouldn't realise it, because we all still call it green. so because it is from our perspective, we don't realise it. is this possible?