President Donald Trump stunned observers on Tuesday when he suddenly appeared on the roof of the West Wing of the White House. Though he insisted he was “just taking a little walk” — or he might have said “taking a little look” — it was definitely weird, so here is some loosely informed speculation about what he was actually doing up there.

USA Today suggested Trump’s Tuesday trip to the roof could “be a first for a president.” But this isn’t true. President Carter, for instance, recounts taking visitors up to the White House roof to stargaze and enjoy full privacy in his book A Full Life.