Red obviously?
Wrong, in fact they are grey!
A picture of a strawberry tart has got the internet talking, because whilst it might look reasonably normal, things aren't quite as they seem.
At first glance it looks like a poorly taken photo, or maybe one with far too many filters on it.
But what is actually in front of you is a picture with absolutely no red pixels.
The red colour of the strawberries is merely your mind playing tricks on you because of the blue background.
Things look different under, for example, fluorescent office lighting than they do in softer, lounge lighting so our brain makes an adjustment to make sure that we still see strawberries as red, regardless of where we're eating them.
It's called colour consistency
Bevil Conway, an expert on visual perception, told Motherboard that "your brain says, 'The light source that I'm viewing these strawberries under has some blue component to it, so I'm going to subtract that automatically from every pixel.'
"And when you take grey pixels and subtract out this blue bias, you end up with red."
And of course, because we know strawberries are red, that also helps the brain give them the correct colouring.
More pictures and a fuller explanation here -
http://www.bbc.co.uk/newsbeat/article/39132378/these-strawberries-are-red-right-wrong
Wrong, in fact they are grey!
A picture of a strawberry tart has got the internet talking, because whilst it might look reasonably normal, things aren't quite as they seem.
At first glance it looks like a poorly taken photo, or maybe one with far too many filters on it.
But what is actually in front of you is a picture with absolutely no red pixels.
The red colour of the strawberries is merely your mind playing tricks on you because of the blue background.
Things look different under, for example, fluorescent office lighting than they do in softer, lounge lighting so our brain makes an adjustment to make sure that we still see strawberries as red, regardless of where we're eating them.
It's called colour consistency
Bevil Conway, an expert on visual perception, told Motherboard that "your brain says, 'The light source that I'm viewing these strawberries under has some blue component to it, so I'm going to subtract that automatically from every pixel.'
"And when you take grey pixels and subtract out this blue bias, you end up with red."
And of course, because we know strawberries are red, that also helps the brain give them the correct colouring.
More pictures and a fuller explanation here -
http://www.bbc.co.uk/newsbeat/article/39132378/these-strawberries-are-red-right-wrong