We use many images in our teaching to lead the attention inwards.
Once we become more comfortable to be with oneselves, the inner world becomes more creative and many images start to be formed that reflect one's being. It is the natural turning of the senses inwards, Patanjali's fifth stage of the Astangha description, leading to meditation.
This is just one image that came about, while visualizing my own inner space....as I was painting, connecting with, rather than isolating from the environmental elements that are part of me...