At Heidelberg, the 25-year-old Rizal, completed in 1887 his eye specialization under the renowned professor, Otto Becker. There he used the newly invented ophthalmoscope (invented by Hermann von Helmholtz) to later operate on his own mother’s eye. From Heidelberg, Rizal wrote his parents: “I spend half of the day in the study of German and the other half, in the diseases of the eye. Twice a week, I go to the bierbrauerie, or beerhall, to speak German with my student friends.” He lived in a Karlstraße boarding house then moved to Ludwigsplatz. There, he met Reverend Karl Ullmer and stayed with them in Wilhelmsfeld, where he wrote the last few chapters of Noli Me Tángere.
Rizal was a polymath, skilled in both science and the arts. He painted, sketched, and made sculptures and woodcarving. He was a prolific poet, essayist, and novelist whose most famous works were his two novels, Noli Me Tángere and its sequel, El filibusterismo.
These social commentaries during the Spanish colonization of the country formed the nucleus of literature that inspired peaceful reformists and armed revolutionaries alike. Rizal was also a polyglot, conversant in twenty-two languages