Enshrined in a gauzy pink enclosure with a stalagmite-encrusted figure at its center, MoCA Arlington resident artist Marissa Long’s Blister Pearl is an installation that recalls both a Renaissance garden grotto and a saint’s sepulcher, sites synonymous with mystery and transformation. Blister Pearl is filled with objects that seduce and repulse: delicate lilies that grow out of oozing human organs and a large cavity in the belly of the figure that is filled with sparkling geodes. Through these objects, Long reflects on time and decay’s role in creation; the oppositional forces that cause one thing to perish so that another can thrive.