An object is a discrete audio element can be placed anywhere in the 3-dimensional sound field. An audio object can utilize as few or as many speakers as is defined by that object's positional and size metadata.  Objects can be static or moving and are not constrained to the outside edges of the Atmos sound field. The choice as to whether to use an object or a bed for a particular sound is entirely up to the mixer, and we encourage you to experiment with both.