We’re surprised when something unexpected happens; by definition, it’s something we hadn’t been thinking about. One way to avoid surprise is to try imagining unthought things. One way to do that is to consider how institutions stop us thinking about certain things. I’ll focus this post on spectrum topics we may not be thinking about hard enough. They include non-local interference, 3D interactions, agencies outside the FCC, the dearth of spectrum zoning, and the end of endlessly increasing demand for spectrum.