His most prolific period as a painter falls in the short period of his stay at the court of the Danish kings Frederick III from 1668 to 1670, and thereafter Christian V from 1670 to 1672. The bulk of his known artistic output was created during this period. In the period from 1670 to 1672 he received payment for several paintings, including paintings for Rosenborg Castle. In contemporary court records he is referred to as 'dend brabandskemaler' and 'Gisbrecht brabanske maler' (the painter from Brabant). These records confirm his Flemish roots. Most of the 22 paintings Gijsbrechts painted in Copenhagen were for the King's Perspective Chamber which was part of the Royal Cabinet of Curiosities. The Perspective Chamber displayed a selection of trompe l’oeil works, perspective boxes and architectural paintings made from the central perspective. Art historian Eva de la Fuente sees in the Perspective Chamber a symbolic representation of a "worldview with the autocratic king at the centre. He is the one who dominates and understands the hidden context of things in the world. Dressed in appropriate martial virtues, he appears as a collector of the marvellous creations of art and nature". An inventory from 1690 records that 15 of the 29 paintings in the Perspective Chamber were made by Gijsbrechts.