Hopping in the shower is a great way to trigger ideas when our brains are in a creative rut . You step in the shower, and you remove a lot of the visual stimulation of your day. Auditorially, it's the same thing, it's a steady stream of "blue noise." You're not hearing voices or processing ideas. You step into the shower and it's like a mini-vacation.
... use combinatory play to give your brain a boost: Participate in creative cross-training to expand your brain’s neural connections. Let your mind wander by doing something mundane, like taking a shower. Go to bed and let your subconscious mind connect the dots during REM sleep. Use another person’s work as a springboard for inspiration and improvement.
How To Boost Your Creativity The Einstein Way-With Combinatory Play
To think we also need distance. Forcing your mind to take a step back is a tough thing to do. It seems counterintuitive to walk away from a problem that you want to solve. Not only does distance facilitate imaginative thinking but it also helps counter short-term emotions.