It helps to think of the shapes as symbols. We are familiar with emojies, especially the heart as a feeling shape. We used the oval as a thought bubble, borrowed from cartoon format. The square as a map, or date in time – an event in the past or happening now. We symbolize potential future actions as an arrow, as for directions, or what follows “next”. We see merit as a star, a common symbol of virtue. We use the triangle as a needs shape, refering to makes sense when we recall Maslow’s triangle of needs:

Who came up with the shapes, why, and how?
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