Luigison, did you not see this notice on his page?
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Most of the material contained within these pages was created by Akiyoshi Kitaoka and is not copyright-free. If you wish to use any of the material for research purposes, personal purposes, or educational purposes, you may do so only if you include a citation. To cite my work, use my name, my website address, the title of my book, or the titles of my papers. For commercial or professional use, please contact me directly. I will forward your request to the publisher "Kanzen" who manages my published material. If you are a journalist and wish to use my material, only I can grant you permission to use my work.
For commercial customers, we can send image files in Adobe Illustrator format (ver. 8 or 10) or in bitmap (jpeg) format of any size. We also have files available in PDF, CorelDRAW, MS-Word, and related formats. <November 18, 2004>
I have received a number of requests asking for permission to upload some of my illusion designs to websites and I have granted such permission on an individual basis. Hereafter, I grant permission to upload to your webpage up to three (3) images if your webpage is not a commercial site and does not contain indecent, obscene, or illegal content. My name and the address of my webpage (a link is OK) should be cited. If the image is shown in one of my books, e.g. "(c)Akiyoshi Kitaoka "Trick eyes" Tokyo: KANZEN 2002" should be included. If you need more images, please contact me. Moreover, a cautionary message or warning like "These images might make observers feel sick" is necessary if they are anomalous motion illusions. <September 24, 2003>
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etc. etc.