Speculative Design And Imagination Relationship

What is the relationship between speculative design and imagination?

How can the imagining process be considered particpatory? or structured to be participatory? (connecting to RQ4-speculative-process-as-particapatory)

Imagining is an act of play - engaging with speculations of alternate realities is playful

Interactions with the constraints of (the imagination) is play >> Direct physical, embodied interactions