I find sense field explorations interesting and helpful.
Here is a very simple version I use for myself:
To stabilize attention, bring attention to the sensations of the breath at the nostrils. Just notice the sensations. Nothing else is required. If attention strays to thoughts, bring it back. It’s all fine. Just notice when it strays, and gently bring it back to the sensations at the nostrils.
After a while, when attention seems more stable, bring attention to sounds, to whatever sounds are here. Notice the sounds. There is no need to do anything about them, just notice.
Then notice sensations in the body. Notice the sensations up and down the body. Noticing is all that’s needed.
Now notice taste. Just notice. And now, smells. Notice the smells that are here.
Notice sight. Even if the eyes are closed, something is there in the visual field. Notice it. It’s all very relaxed, just notice what’s there.
With the eyes closed, notice the images that are here. The images of your body. The images of what you are sitting or laying on. The images of the room. The images of the building. Of other people. Of the city. The sky. Trees. The country. The earth. Notice all these images. They are all images, all imagination.
To explore how the mental field overlays other fields:
Now bring attention back to the sensations in the body, and notice how the images of your body helps locate these sensations. There is a sensation, an image of your right calf, and a thought that the sensation is an itch on the right calf.
Notice the sounds. Again, notice how your images helps locate the sounds in space, and offer an interpretation. There is a sound, an image of where it comes from, and an image of children playing.
Exploring space and time:
Now notice how there is an image of space, and how other images are placed on this image of space. There is an image of space, and overlaid on this image is an image of your body, the room, the building, the garden, a street with cars, the city, the country, the Earth.
Think of something that happened this morning. Notice it’s an image, it’s imagination. Think of something that may happen later today. Notice it’s an image. Think of what’s here now. Notice that’s an image too. Now notice the image of time that tells you that one is from this morning, in the past, one is about later today, in the future, and one is about what’s here now. Is this an image of a continuum? Does it contain divisions of past, future, and present? Are these divisions solid or a bit fuzzy?