July 1 was our last full day in Europe. Could we sleep in? No way – the bus to the Prague Castle, where we had guided walking tours set up, left at 8:30 AM. And yes, I’m willing to get up early to tour a medieval castle dating back to the 9th century (rebuilt multiple times, of course)! In fact, we didn’t get into the Castle at all; we spent most the tour of the hilltop in St. Vitus’ Cathedral, a Gothic building. The first interesting thing I saw was this wall:
Yes, it’s an optical illusion – no matter how it looks, that wall is flat. It’s etched in a technique called sgraffito, to give the impression of a wall decorated with diamond-shaped plaques. It’s flat. I put my hand on it.