A gold plated joke

The summer palace of Portuguese royalty, otherwise the National Palace of Queluz is massive and wow. The ballroom, shown below is big enough for a tussle between the 49ers and the Cowboys. Way up high on a pillar on the left side are a man and woman. She’s holding her hand on her head (” sorry not tonight love, I have a headache”) and with her other hand protecting her privates. On the pillar on the right side of the ballroom, the same – except the positions are opposite. Whatever