They're both in there. Trust me!

Now imagine the cross is a motorbike and think about them
next time you go out in the car!

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See this image appear to shimmer as you look at it?
If that's not enough follow the ridge around the circle
and watch it change into a groove...

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OK, a very straight forward test for you.
Simply read out loud the following list of colours,
remembering to read the text only...

The reason you might be struggling with this relatively simple task
is that one side of your brain is telling you the word
while the other side is showing you the colour.

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Stare at this image long enough and you'll start to see
it move before your very eyes...

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Just in case you aren't feeling ill enough already, check this one out.
To enhance the effect scroll up and down...

Someone pass me a bucket!