[5] Whilst living in Berlin Nietsche befriended a post-graduate student and later a lecturer in English at the University of Leipzig, the Dubliner Michael O'Brien.

[9] At the invitation of Major R G Heyn, Nietsche's work debuted in Canada in 1936, with an exhibition at the Continental Galleries of Fine Art in Montreal.

[11] During World War II Nietsche was interned on the Isle of Man "with chess-playing intellectuals",[9] before re-establishing himself on the Belfast art scene by opening an attic studio at 76 Dublin Road in the city where he was to work from 1942 until the end of his life.

[1] In 1943 Nietsche showed alongside Stanley Prosser, Seamus Stoupe, and Newton Penprase in the annual Ulster Arts Club exhibition at the Belfast Municipal Gallery.

[12] Art collector and patron Zoltan Lewinter-Frankl opened an exhibition of Nietsche's flower paintings at Tyrone House on Belfast's Ormeau Avenue in 1945.

The latter comprised 21 paintings and was opened by his good friend, the Lisburn writer Barbara Hunter,[16] whom along with H E Broderick, had contributed a foreword to the 1947 exhibition.

[17] The 1949 exhibition included portraits of the stage actors Robert H McCandless, and James G Devlin and the catalogue contained a foreword by the Odd Man Out writer, FL Green.

[18] The reviewer for the Lisburn Standard commented,"Though small in some ways, it is the finest show Nietsche has had in Belfast, for as the years go by he seems to acquire even greater genius in his art, so that he seems at times to almost improve upon nature, adding his own vitality and sensibility to his lovely studies of flowers and fruit.

[18] Nietsche parodied local attitudes to modern art in a 1948[20] play and in 1949 he contributed one poem, A Vision, to the shortlived Ulster poetry journal Rann established by his old friend Barbara Hunter and Roy McFadden in the previous year.

[23] The actor Jack Loudan described Nietsche's charitable nature in 1972, in repairing broken dolls, cars and trucks, which he would later distribute to underprivileged children around Castlewellan, County Down.

[26] His home and studio were open house to visitors from members of Belfasts artistic and theatrical world, whom Nietsche would entertain with coffee and conversation whilst he continued working.

He was at his best when painting still lifes [...] flowers and portraits [...] His landscapes by comparison are less successful, the compositions often lacking resolution while the colours are occasionally muddied and less boldly stated than in his other works.

"[3]Paul Nietsche died in Belfast City Hospital on 4 October 1950, after falling ill at his studio four days earlier whilst preparing work for exhibition in London and Dublin.

Amongst the mourners were Zoltan and Anny Frankl, Jack Loudan of CEMA, Professor J L Montrose of Queen's University, and Joseph Tomelty and R H McCandless of the Group Theatre.