I had Grace visit me from the UK a couple of month ago. She was especially intrigued by some of my stripe images, so I did a setup to recreate some of those for her.
Usually, I would hang a string curtain in front of a sunlit window.
However, as we had no sun, I set up a focusable spotlight to give a pointed light source instead of the sun. The main problem with this is the amount of light you can use is very limited so as not to overheat the lamp/spotlight.
I have previously set an Elinchrome flash lamp on fire this way…
Btw. If you like this, try to key in "stripes" in the tag section and search.