Science & Design
The sentence ‘subjects' (people and dogs usually) are two upside-down triangles that are closer together. These somewhat look like legs or teeth, and in nature, two immediately adjacent upside-down triangular-shapes usually only happen when there are animals involved.
The sentence ‘objects’ are much smaller (things we typically call 'objects' are usually on the smaller side), and are in a range of different orientations. For example, while we usually see people right side up, we might see a dog bone in a range of different orientations.
The 'places' or 'where' words are large (as places tend to be) and look like pyramids or hills.
The 'actions' or 'verbs' tile contains waves or curves, which are typically associated with motion (there are relatively very few frozen waves!). Another time that such curves occur in nature is in the arc of a thrown object.
The 'descriptor' words are depicted as a combination of curve and triangle. As 'modifiers', they are themselves a visual combination.
The 'social' words are meant to be the most distinctive. A grid pattern such as the one it depicts is usually only found as a result of human intervention (perfect squares and rectangles are extremely rare in nature yet extremely common in the things we build).