For example if I asked you to picture a cat sat down on a mat and hold the image, can you?
And if I said ok, make the cat stand up and walk forwards, can you do that too?
Could you then change the colour of the cat?
Change it back how it was?
Make it bigger?
Make it tiny?
I've read stuff in books where they ask you to do this kind of thing and I fall at the first hurdle, because I can only picture the cat for a second before it morphs into something else that I have no control over which then morphs again ad infinitum. So, I wondered what kind of minority I'm in.
Try and do the above and let me know how far you get.