Fragile Treasures of the Prinzhorn Collection: rare works from the historical Prinzhorn Collection. Fragility and vulnerability, mirroring the experience of psychological crisis, are qualities evidenced by the motifs of the works as well: delicate, ephemeral figures, spirits, angels and winged creatures, birds, butterflies, and fairies are depicted time and again. Often, they are threatened by mythical creatures, such as dragons and sphinxes, or by the Grim Reaper himself.