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Form is a three-dimensional object that can be constructed by two or more shapes.
Take a look at the image below of a simple box.
You take one shape, slap it onto another, and now you've created depth—the third dimension that differentiates form from shape.
If you take three shapes and put them all together, there's a better sense of that depth.
The form above becomes three-dimensional, meaning that it has three coordinates: width, height, and depth.
When you have a three-dimensional form, you also create volume, which is the amount of three-dimensional space a form occupies.
Looking at the two boxes above, the box on the right has more volume than the smaller box on the left.
EXAMPLE
Imagine that you have two cups: a huge coffee mug and a tiny espresso cup. Clearly, one would hold more fluid than the other, so one occupies more volume than the other.When thinking about form, it's important to note that you can have different types: geometric form and organic form.
Geometric from is defined by its allegiance to mathematical construction.
The basic shapes above (sphere, cube, and pyramid) are geometric forms. Typically, shapes with angular and hard edges are considered geometric.
EXAMPLE
You can see a lot of geometric forms in architecture, products like consumer electronics, and shipping containers.Organic form, on the other hand, is defined by its simulation of natural substance. Instead of the hard edges of geometric forms, organic forms have irregular, complex, curvy, and varied contours, much like you see in nature with hills and mountains or in the details of faces and hands.
Source: THIS WORK IS ADAPTED FROM SOPHIA AUTHOR MARIO E. HERNANDEZ