When the invasion from the fourth dimension came, it had unexpected benefits. The new overlords were surprisingly mild. They only wanted the Earth for Qling, a substance we neither understood nor needed. They filled enormous eye-warping four dimensional tankers with a cargo we couldn’t even perceive, then left us in peace. A few stayed, having found human friends and even lovers.
My neighbour is one such. We met when xe returned my lost cat. “I don’t know how she keeps getting out”, I said, “all the doors and windows are shut”.
“What about that gap there?”
“Where?”
“Oh of course, it’s invisible in three dimensions. Here let me close it up.”
The cat is still furious about this.