The height of your ceiling can either help or hinder creative thinking. According to Sally Augustin over at Psychology Today:
We’re more creative in spaces with higher ceilings. All else being equal, people are more innovative in places with 10 foot ceilings than they are when the ceiling hovers 8 feet above the floor.
When the ceiling in a room we’re in is lower than about 9 feet, we start to feel crowded and want other people (except those we’re on really good terms with) to stay farther away from us. If we feel crowded or cramped we get stressed and distracted from whatever we’re trying to accomplish.
It isn’t a case of “high = good, low = bad,” though. Spaces with low ceilings can be comfortable and inviting when we want to spend time with intimate friends.