It may be that Dürer then met for the first time too the Imperial architect, Johannes Tscherte, for whom he afterwards drew two armillary spheres, to take the place of those on which he had cast ridicule; for Pirkheimer wrote to Tscherte: "I wish you could have heard how Albert Dürer spoke to me about your plate, in which there is not one good stroke, and laughed at me. What honour it will do us when it makes its appearance in Italy, and the clever painters there see it!" To which Tscherte replied: "Albert Dürer knows me well, he is also well aware that I love art, though I am no expert at it; let him if he likes despise my plate, I never pretended it was a work of art." And in a later letter he speaks "of the armillary spheres drawn by our common friend Albert Dürer." He was one of those who helped Dürer in his mathematical and geometrical studies; and he, like Pirkheimer, dedicated books to him. Although the mathematics of those times are hardly considered seriously nowadays, they then ranked with verse-making as a polite accomplishment, and had all the charm of novelty. Dürer, no doubt, had some gift that way, as he seems to have made a hobby of them during many years. Besides those who came in the Imperial troop, Dürer had many opportunities of meeting men of this kind, for such were constantly passing through Nuremberg. Dürer has left us what are evidently portraits of some whose names are lost: of others we have both name and likeness, among them the English ambassador, Lord Morley.