Among the first objects photographed was a head of Romanesco, seen here, chosen for its very detailed texture.
You can explore this image at:
www.slac.stanford.edu/~tonyj/osd/public/romanesco.html
(LSST Camera Team/SLAC National Accelerator Laboratory/Rubin Observatory)
Credit: LSST Camera Team/SLAC National Accelerator Laboratory/Rubin Observatory