Hi Helen, you can find some modular stars here but I do not recall one having the appearance as you described. http://www.origami-resource-center.com/origami-stars.html
In the link below is a 5 pointed star (starts with a pentagon) which does have a curved center. See third photo on left. http://www.origami-resource-center.com/stars.html#down Diana ----------------------------------------------------------------------------- http://www.origami-resource-center.com/ -----------------------------------------------------------------------------
