Tutorial on two romatic hearts

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We illustrate the practical advantage of having submodels within a project and we illustrate an important consequence of understanding biological growth within the GPT-framework.

The aim is to grow a disc into a romantic heart

Interaction function in detail (A newly created, empty, interaction function is shown here.)

Some details	Pattern of isotropic specified growth (no polariser)	Pattern of isotropic specified growth after growing to 3 times the original area.
Some details	Pattern of specified polariser levels (green-cyan). Polariser can diffuse and the gradient is arrowed. Uniform specified growth (red).	Patterns and shape after growing to 3 times the original area.