Each component can be assigned its own layer in the arrangement vs. there is no equivalent way of dividing the arrangement into layers.

Each component can be assigned its own layer in the arrangement vs. there is no such way of dividing the arrangement into layers.

Put differently, if the examples are imagined to be arrangements of rigid sticks/hoops/etc resting on a flat surface, positive examples include sticks/hoops/etc that could be picked up without disturbing the other objects.

Put differently, if the examples are imagined to be arrangements of rigid sticks/hoops/etc resting on a flat surface, positive examples include sticks/hoops/etc that could be 'picked up' without disturbing the other objects.

There is a "top layer" vs. not so.

There is a component that rests on top of other components vs. not so.

Put differently, if the examples are imagined to be collections of rigid sticks/hoops/etc resting on a flat surface, positive examples include sticks/hoops/etc that could be 'picked up' without disturbing the other objects.

Leo Crabbe