Did anyone else find this one very mysterious? I thought that the order should be: slim-necked (F); conical (A); round (low A); straight (C); wide-necked (low C). But this didn't work. I found the sequence which worked from a waltkthrough guide which said: wide-necked (low C); conical (A); large (?); straight (C); round (low A). The large vase did not sound a pitch.and the pitch relations for the other vases does not correspond to the chart as far as I can see. No matter, I have got through the door but it is unsatisfying not to have 'got it'