# Toy model

In the modeling of physics, a **toy model** is a deliberately simplistic model with many details removed so that it can be used to explain a mechanism concisely. It is also useful in a description of the fuller model.

**In "toy" mathematical models**, this is usually done by reducing or extending the number of dimensions or reducing the number of fields/variables or restricting them to a particular symmetric form.**In "toy" physical descriptions**, an analogous example of an everyday mechanism is often used for illustration.

The phrase **"tinker-toy model"** is also used, in reference to the popular Tinkertoys used for children's constructivist learning.

## Examples

Examples of toy models in physics include:

- the Ising model as a toy model for ferromagnetism, or lattice models more generally;
- orbital mechanics as described by assuming that Earth is attached to the Sun by an elastic band;
- Hawking radiation around a black hole described as conventional radiation from a fictitious membrane at radius r=2M (the black hole membrane paradigm);
- frame-dragging around a rotating star considered as the effect of space being a conventional viscous fluid.

### Spekkens model

## See also

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