Often times a sadhak is instructed to do things which broadly can be described as visualizations. However, people often have the wrong ideas about what it means. Any so called visualization is representing (or should represent) an aspect of true reflection, so to view the process as "imagination" isn't or shouldn't be accurate. One often hears people say that they can't visualize something because either they aren't visual or that they don't have a good imagination. Often, this is more a function of wrong view or lack of confidence, then any real impediment. To demonstrate, for one who claims to fall into that category, please do the following experiment: "first close your eyes, now do you still have an idea of what you look like? and do you have an idea about what the room you are in looks like?" For all, this will be no problem because one is sure and confident. Moreover, the reflective process of taking those aspects as true are well reinforced. In many ways, the image of ourself and of our environment are nothing other than visualizations (eyes open or closed), but that is a tangent to explore at another time. The governing factor is conviction, so with any sadhana where one is told to "visualize" something, one should get the feeling of it first. In fact, the feeling is the most important factor which speaks directly to the resonant accord of whatever one is instructed to do. For example, lets say one is instructed to think of themselves as Ganapati with ones Guru over their crown, seated on a throne, and from one's/Ganapati's heart emanates rays of light that removes the obstacles of all beings. So represented here are several feelings (i.e. points of resonance), accord with the devata, devotion to the guru, divine pride/presence, and compassion. When one is told these types of visualizations, it isn't an art project be built scenes in the mind, but rather a description of a state of being. To come into accord with what is described is to BE it, and to visualize is to simply regard what is there (accurately).