[2] After the death of his father in December 1871, he visited Verona, Venice, Ravenna, Bologna and Florence.

[2] After initially painting allegories, Robert turned his talents next to landscapes, and eventually to watercolours of birds and caterpillars.

His painting Zéphyrs d'un beau soir won a gold medal when exhibited at the Paris Salon in 1877.

[4] He illustrated an edition of Jeremias Gotthelf's 1842 book The Black Spider.

The Neues Museum Biel  [Wikidata] houses the 3,000 works of the "Foundation Robert",[6] including hundreds by Paul, and others by the rest of his family.