1) Dream 2) Image 3) Visualisation 1) Image 2) Mental image 3) Visual image 4) Visualisation 
[computer graphics] Visualization or visualisation (see spelling differences) is any technique for creating images, diagrams, or animations to communicate a message. Visualization through visual imagery has been an effective way to communicate both abstract and concrete ideas since the dawn of man. Examples from history include cave paintin...
The process of seeing images in your mind.
(vizh″oo-әl-ĭ-za´shәn) the act of viewing or of achieving a complete visual impression of an object. use of a person's own imagination and positive thinking to reduce stress or promote healing.
The process of forming mental images. Magickal visualization consists of forming images of needed goals during ritual. It is also used to direct personal power and natural energies for various purposes during magick, including charging and forming of the magick circle. 
visualisation noun a mental image that is similar to a visual perception
Mental skill used to imagine or mentally rehearse a race.