The secret of 127. Choc des opinions- Amsterdam, in eigen beheer (self published by) Nicolaas Kroese Five Flies Anno 1627 (Quinta essentia), z.d. (ca. 1968), (67) sheets., 4to. Signed and dated on the frontwrapper.
Important Pre-Provo document. Collection of the pseudo-scientific ideas of Nicolaas Kroese (1939), the founder and owner of the famous restaurant "The Five Flies" (De Vijf Vliegen) near the Spui (which still exists). He was the maecenas of the Provo’s , and a fantasy-rich private philosopher. He has also supported the anti-smoke movement of Jasper Grootveld and offered him the location of the anti-smoke temple, which lateron went in flames.

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