### 2-D Shadow concept - The Incredible Truth

# Is a Shadow 2-Dimensional ?

What is dimension?

Dimension is a measurable parameter(s) of a particular
object. It describes a form or shape of something to particular measurements.
There are basically three types of dimensions in a real life object, such as
length, width and height or depth. Every object should have these three
measurable parameters.

3-Dimensions
:

Three-dimension is a nomenclature of a space where the three
measurable parameters, such as length, width and height are combined together. Three-dimension
is abbreviated as 3-D. Every real life known objects has length, width and
height, So every known object in this universe is 3-D object. Three-dimensional system has three axes (X, Y,
Z). ‘X’ denotes the length axis, ‘Y’ denotes the width axis and ‘Z’ denotes the
height axis.

3-D Space:

Three-dimensional space is actually a geomagnetic three
parameter (length, width & height) model of the physical universe in which
all known matters or objects exist. But in this space only those matters or
objects are considered which has some mass. There are some more parameters
which don’t have mass but exists like time. Time is not considered in the
three-dimensional space.

3-D objects:

Every real life objects are 3-D objects as they all have
length, width and height to measure. We live in a 3-D world. From an atom to a
building, from a cell to a man or a tree everything is three-dimensional. Every
object has 3-D structure. Every known matter is made of atoms and atom is
mainly made of three particles, such as proton, neutron and electron, And all
these basic or unit particles are three-dimensional in structure. That’s why
all the objects made by these particles usually are 3-D.

2-D objects:

Two-dimensional objects are those which have two dimensions,
such as length and width. This system doesn’t contain the height parameter.
Two-dimensional system only has two axes (X, Y). As usually ‘X’ denotes the
length axis and the ‘Y’ denotes the width axis. It means that 2-D objects only
have length and width. But problem is that, no such objects or particles we can
imagine which has only length and width to measure. All real life objects have
three-dimensions such as length, width and height. The height may be very small
to measure but an object should have height. Like, a paper has a very small
height, but it can be measured by very small scale.

So, is there any 2-D object in
our physical world ?

Let’s talk about the Shadow:

Actually shadow is not an object or particle as it has no
mass. Shadow is just an area covered by darkness and surrounded by areas of
brighter light, caused by an object blocking inside light rays. In this
particular perspective we can consider the shadow as a two-dimensional object,
because it has only length and width to measure but it has no height. So we can
say that shadow is a 2-D shape or area.

But it is not the final conclusion, because you can also
consider a shadow as 3-D if you think about a shadow cast on a staircase.

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