“The Dreamer” exhibition —which opens on May 5—is conceived as a series of cinematic sets or stages: entry ignites family obsessions; the library pulses with late-night wisdom; stables clash hoof and blade; the finale unpacks the 1869 will’s eternal gift. Velvet drapes, gaslit flickers, war drums, horse whinnies touch the scars of an era. History not on shelves, but alive: What will you donate to tomorrow?

