The flower as seen from the side
In originall trained the vines up along the window pane using thin stakes and strings suspended from the top of the window frame but once they reached the top they started twisting chaotically in every direction and though the effect was not quite what I had expected I gave up trying to coerce them into a tidier pattern. They appear to like it because now they are setting lots of flower buds.
The flower as seen from the window side
Considering how many more buds the plants have I hope that this is only the beginning; nevertheless, it is already quite satisfying to have achieved even one flower, seeing as I had never grown morning glories inside and even in the garden they only ever seemed to do well for me when I just scattered the seeds and then left them to their own resources...