One of Carl Palazzolo’s frequent themes, art collector David Rawle says, is memory and loss. You can see it clearly in the petal paintings —Palazzolo painted many images of petals falling from their stems, each one the slow, graceful death of a moment. These watercolors, along with the vibrant, color-focused watercolors of Stephen Mueller, will be exhibited in the Gibbes Museum during this year’s festival. All of them were painted at Rawle’s home on Anson Street over more than 20 years. Palazzolo and his friend and fellow artist, Stephen Mueller, would come to Charleston from New York each year for the festival, staying with Rawle and his wife Carol and painting the mornings away. Palazzolo still visits; Mueller passed away in 2011. And though the time the four of them spent together is gone for good, the memories are ensconced in the artwork that fills Rawle’s home — and, now, the Gibbes.