6:13 PM, Wednesday May 10th 2023
Hello, I can try to offer some help.
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Yes, you draw the visible sides of your cross sections. Remember what you learned from the organic forms lesson and figure out which way the forms are turning - what sides you will see and which ones will be covered.
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Kiwis do have cast shadows. In fact, Uncomfortable draws kiwi texture and explains his process in the video for the Dissections lesson. It is long, but I would highly recommend watching it. The case could be the references you found don't have cast shadows or the cast shadows are very small and you aren't noticing them. Take a look at this image: https://www.britannica.com/plant/kiwi-fruit#/media/1/319772/120948 The cast shadows of the cut face fall darkest on the undersides of the seeds and in the divots between ridges running out from the center.
I would recommend checking out some Pinterest boards for ideas and reference images - there are quite a few to choose from.