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LATENT REFERENCES / TAG3

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This reference note belongs to Tag3 in Latent References, an archive curated by Keigo Yoshida. Its archive region is Media art timeline. The note preserves its source text and links so that readers can trace the material behind the 3D map.

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Tag3
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Media art timeline

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English translation of the archived note. JP shows the original text. Source links and literal code are retained; the translation does not update or independently verify the source claims.

chat: Redefining shadows and sonic space Of course. Based on the attached materials and exchanges with Abe, the core this time is quite clear. **I think the core production theme is “redefining shadows as media connecting self-recognition, spatial recognition, acoustic feedback, and technological history, rather than mere visual effects.”** These 4 axes initially seem important when reading the materials. 1. History and ideas of shadows From Plato's cave, Christian painting, theater, film, and animation to doppelgängers, shadows have been treated as “proxies for substances,” “the self made other,” and “visualizations of the invisible.” The materials particularly emphasize that shadows have renewed their meaning with each appearance of new technologies such as film, animation, and interactive art, rather than developing independently. 2. Shadows in media art In early interactive art, shadows were used as the body's most intuitive input data. Shadows are therefore a primitive yet powerful interface linking “embodiment” and “image processing.” The material emphasizes Lozano-Hemmer's linking shadows to social criticism and readings of public space rather than using them merely as visual effects. 3. Technical features of ShadowUp / SU. ShadowUp is an experience of “bringing shadows out in three dimensions” rather than illumination. Its proprietary StereoLight and 3D glasses present different shadow images to the left and right eyes, forming three-dimensional images of shadows, reflected light, and transmitted light within space. Especially interesting is the ability to treat shadows as “moving, touchable, searchable, transformable spatial phenomena” rather than “fixed images,” using fixed lights, handheld lights, caustics, mirror balls, robot arms, and so on. 4. Points connecting to future artwork proposals. Combining Boulez/IRCAM/real-time feedback, 40Hz resonance, caves and rituals, spectra, and spatial audio discussed with Abe, the following is quite a strong direction. A work treating shadows as input, sound as response, and space as a memory medium. That is, it 3D-maps viewers' and objects' shadows, converting their shape, density, scale, and fluctuations into acoustic parameters. It also incorporates the space's own resonant frequencies and acoustic stimulation near 40Hz as external factors, creating a feedback loop in which shadows and sound alter each other. In particular, the materials’ conclusion states that developing ShadowUp as international art requires social meaning, criticality, and connections with AI/data science, beyond simple shadow play. This is quite important: connecting it with Keigo’s research and production would be stronger if extended beyond **“the beauty of shadows” to “modulation of self-recognition through shadows,” “changes in bodily state through spatial sound,” and “AI interpretation of shadows and sound.”** The next thing to do is to take the materials ① Reference history ② Technical specifications ③ Work concept ④ Implementation proposal ⑤ Materials for the next proposal to Abe It is best organized into 5 chapters for a presentation. [ ](file:///Users/keigoyoshida/Desktop/Abe-san/%E5%BD%B1/%E5%BD%B1%E3%81%AE%E6%AD%B4%E5%8F%B2.pdf) A work treating shadows as input, sound as response, and space as a memory medium. That is, it 3D-maps the shadows of viewers and objects and converts their shape, density, scale, and fluctuations into acoustic parameters. It also incorporates the space's own resonant frequencies and acoustic stimulation near 40Hz as external factors, creating a feedback loop in which shadows and sound change each other. Please research as thoroughly as possible whether any studies or works have already done this. Thinking time: 1m 0s As far as I have researched, I have not yet found a representative work or study fully integrating the identical configuration: “3D shadow mapping → acoustic response → spatial resonance/40Hz → feedback loop.” However, there are several quite close precedents. The closest example is Rafael Lozano-Hemmer's “Frequency and Volume” (2003). It tracks participants' shadows, scans radio frequencies according to their positions, and controls volume according to their size. Thus, a “shadow = interface for manipulating sound/frequency” already exists. It is described as sounding up to 48 frequencies simultaneously, with bodily movements composing the sound environment. The next closest example is the Japanese research/work “sonodial.” This interactive sound installation uses Kinect to acquire participants' 3D shapes, generates and projects artificial shadows, and changes the sound parameters of granular synthesis through their movement. It is quite close in terms of “3D-acquired body → shadow → sound generation.” David Rokeby's “Very Nervous System,” though not involving shadows themselves, is also a classic precedent converting bodily movements into music in real time. Because body positions and movements are converted into multilayered sound, it is important in the lineage of “turning bodies/spaces into instruments.” Lozano-Hemmer's Body Movies, 2001, is also important as an example connecting shadows with public space, memory, and otherness. Portraits photographed in the city appear within passersby's enormous shadows, using shadows as “media reflecting others' memories.” Care is needed regarding 40Hz and cave resonance. Acoustic studies of ancient sites and caves frequently report resonances around 90–120Hz at places such as Malta’s Ħal Saflieni Hypogeum; it does not seem that 40Hz itself has been centrally demonstrated in ancient caves. Meanwhile, it is true that 40Hz sensory stimulation attracts attention in research on brain gamma rhythms and Alzheimer’s, and MIT-related studies continue investigating the neuroscientific effects of 40Hz light and sound stimulation. So the conclusion is that each element has precedents, but Keigo's proposal has ample originality. What is particularly new is not merely “making sound with shadows,” but Turning shadows into 3D data, converting them into sound generation, and incorporating spatial resonant frequencies and 40Hz stimulation into the feedback loop as “external factors.” I think this could become quite a strong proposal by integrating Lozano-Hemmer-style shadows/public space, Rokeby-style body–sound interaction, sonodial-style artificial-shadow sound, and archaeoacoustics/neuroacoustics. chat

Source updated 2026-07-22 · Snapshot 2026-10-08