Next, focus in on several of these impossible wishes and use them as creative stimuli to generate ideas that are novel but more realistic.
I don't necessarily disagree with this as a tactic for generating good ideas but "saying impossible wishes" and "more realistic" seem contradictory, Dreaming allows you to come up with ways to approach a challenge but it also means someone might struggle to come up with ideas if they already see certain wishes as impossible.
Each member of the group gets a marker. Participants write their ideas on a paper and then rotate, adding their thoughts own original and ideas to the page as well as building upon those of their colleagues.
This is the ideation equivalent of "Yes, and?" improv and I really appreciate that this was included as a form of ideation. In improv, building on the prompts and imagination of your improv partners requires a willingness to let go of your idea and let it morph into something bigger than you and turn a 2-dimensional idea, into something truly interesting.