It's the full moon tonight/tomorrow, so the offerings of foods to gods and spirit money to ancestors. I found out recently that sometimes offerings are made inside. Something to do with ghosts, though whether it's to ward them off or attract them to the offering so that the Ghostbusters can catch them I'm still unclear. It's a really big weekend, being the last full moon of the lunar new year. I even saw a priest of sorts at someone's house offering today.