If you were to look at the ingredients listing on that nutrition label on that bottle of soda, you would see the chemical compounds that comprise it. So, we can say there is a space and a time where something is located and that something is a bottle of soda where the soda in that bottle is comprised of molecules that are compounds like carbonated water, caramel color, sodium benzoate, and other compounds of that nature. Those chemical compounds can be further thought to be comprised of atoms and those atoms are comprised of atomic particles and so on and so forth. While we interact with objects like bottles of soda on a general, abstract, and high-level domain, there are lower-level domains of that bottle of soda where you have stuff like molecules, atoms, protons, neutrons, and electrons all just moving around and interacting. We can think of each level of the domain as a box.
Think of there being a box that you can open. On the first box is the label space-time. When you open that box, there are a lot of smaller boxes labeled with places and times. When you open that box, there are a bunch of things labeled as particular tables, chairs, and sodas. When you open the box of soda, you see boxes labeled with things like water, caramel, and sodium benzoate. When you open any of those boxes, there are boxes labeled with atoms. When you open those boxes, you see boxes labeled with electrons, protons, etc. Let’s put a caveat in there. A box cannot open itself; however, it can open boxes that are inside of itself. This is to say one box only has access to the boxes it can open from inside its box. Boxes can’t open any boxes that they are in, but they can open boxes that are nested inside of themselves.
Whenever you think of something, you can say there is a time and a place you had that thought. So, we can say that there is a box labeled space-time. When we open that box, we see a bunch of smaller boxes labeled with places and time. If we open the box that has the time and place I had that thought, you can find a box that has that thought. When you open that box, you will find a box labeled with a brain and so on and so forth concerning boxes and their corresponding physical layer. The idea of boxes, labels, and categories is an illustration of how objects can be regarded in a lower and higher-dimensional sense.
Higher-dimensions and higher-dimensional planes are somewhat of a buzzword. The term is a staple Deus ex machina in science fiction to explain other realities and parallel words. Words like frequencies, vibrations, energy, and higher-dimensions tend to be commonly tossed around in various flavors of subtle energy and occult-based paradigms. How higher-dimensional things are depicted in science fiction, fantasy, and even in various flavors of occultism are not accurate representations of what a higher-dimension is. What a higher-dimension is can be seen in a very simple example. Let’s arbitrarily pick the number 10. We can agree that 10-1=9, so this means that 10 contains within itself 9+1, right? You can get from 9 to 10 by adding 1 where 10 is higher than 9. We can say the same thing for 9. 9-1=8, so this means to get to 9 from 8, you add 1, right? So, 9 contains within itself 8+1. Because 10 is comprised of other numbers and the comprising numbers are also comprised of numbers, we can view 10 as more abstract than say the 1’s that comprise it. You can think of a higher-dimension as being at least n+1 dimension. A dimension is an abstraction for sets, categories, classes, etc.
What makes a physical object a physical object is not necessarily it being material. Some people think of things such as electromagnetic fields, gravitational fields, and certain types of physical energy as not physical. Physical things being material things that could be held conforms to a lot of people’s intuitions; however, physical objects can be “immaterial” in an intuitive sense of the word and abstract. Things like gravitational and electromagnetic fields and even physical energy are abstract, but they are still physical. What makes something physical is whether that object has instances of when’s and where’s or an ensemble of where and when you will probably find it. In other words, pointing to something and saying that it is physical is really generalizing, and thus abstracting, domains of space and time.