I often make idea drawings at some time during the duration of the design phase of a project.
Similar to making a physical model of the project, idea drawings take time and are a kind of meditative practice focusing on the nascent building but shedding the usual constraints of setbacks, budgets and functionalism. There certainly is a kind of mind/body thinking that is enacted only when the hands are engaged in making whether that be cardboard and glue or pencil and paper.
On occasion these drawings are more explicit imaginings of the project space itself, like the image above. At maybe the other extreme, they can be drawings of just the site or something on the property that sparks the imagination and may not directly influence the project but place you on the site for some concentrated time.
In all cases, they are akin to a slow marinating of the project, stepping away from the quick prep of all the necessary requirements of utility, function, structure and budgets.