A field associates a value to each point of 3D space. In engineering, fields are used to represent spatial variations of physical quantities, like temperature, stresses, or flow velocity. For design and 3D modeling applications, these values are usually scalar numbers, in which case we have scalar fields. Tensor fields, vector fields, and boolean fields are also used in many engineering and design applications. You can use basic math operations — addition, subtraction, multiplication, and division — to modify existing fields or create more complex interactions between them.