Picture (someone or something) in(side) (of) (something) phrase
To form a picture in your mind of what something or someone might be like if they are inside of something else.
Whenever she looks at me, she always pictures me in a wet pant as one of my embarrassing childhood moments was caught by her.
Having pictured myself living inside such appalling conditions, I was overcome by waves of nausea immediately.
Whenever I picture myself in the uniform of that highly prestigious university, I would fill with a strong sense of pride.
If you say that something is all in the mind, you mean that it does not real and just exists in your thoughts.
The verb" picture" must be conjugated according to its tense.
This phrase is probably based on the figurative use of the verb "picture".