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Casting (type conversion) is supported between types and class types. Syntax:
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Two forms of casting are possible: widening and narrowing
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Widening, where the subclass is used as an instance of the superclass, is performed implicitly
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Narrowing, where the superclass is used as an instance of the subclass, must be performed explicitly
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Given Parent: Dot -> DrawableDot (Child):
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Widening: An instance of DrawableDot is used as an instance of Dot
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Narrowing: An instance of Dot is used as an instance of DrawableDot
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Casting between sibling classes is a compile-time error
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