Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Symmetrical Reality: Toward a Unified Framework for Physical and Virtual
  Reality   In this paper, we review the background of physical reality, virtual reality,
and some traditional mixed forms of them. Based on the current knowledge, we
propose a new unified concept called symmetrical reality to describe the
physical and virtual world in a unified perspective. Under the framework of
symmetrical reality, the traditional virtual reality, augmented reality,
inverse virtual reality, and inverse augmented reality can be interpreted using
a unified presentation. We analyze the characteristics of symmetrical reality
from two different observation locations (i.e., from the physical world and
from the virtual world), where all other forms of physical and virtual reality
can be treated as special cases of symmetrical reality.

13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th