2. Invariant Sensorimotor Features ("Affordances"). To say this is not to declare oneself a Gibsonian, whatever that means. It is merely to point out that what a sensorimotor system can do is determined by what can be extracted from its motor interactions with its sensory input. If you lack sonar sensors, then your sensorimotor system cannot do what a bat's can do, at least not without the help of instruments. Light stimulation affords color vision for those of us with the (...) right sensory apparatus, but not for those of us who are color-blind. The geometric fact that, when we move, the "shadows" cast on our retina by nearby objects move faster than the shadows of further objects means that, for those of us with normal vision, our visual input affords depth perception. From more complicated facts of projective and solid geometry it follows that a 3-dimensional shape, such as, say, a boomerang, can be recognized as being the same shape Ð and the same size Ð even though the size and shape of its shadow on our retinas changes as we move in relation to it or it moves in relation to us. Its shape is said to be invariant under these sensorimotor transformations, and our visual systems can detect and extract that invariance, and translate it into a visual constancy. So we keep seeing a boomerang of the same shape and size even though the shape and size of its retinal shadows keep changing. (shrink)

The Seed Thoughts proposed by YU Youngmo and HAM Sukhun may each be summed up by propositions expressed in “People are a May-fly seed” and “Seeds embody the eternal meaning”. They used “seed” to refer to humans or people on the one hand and placed the notion of seed in the holistic context of the Eastern Asian tradition on the other. Then, I seek to connect the anthropological notion and the holistic notion via cheng(誠) or integration. 『The Doctrine of the (...) Mean』says that any ultimate integration(至誠) reflects the total nature of objects involved(盡性) by showing that self realization and all other realizations are one and not two(成己成物) and by arriving at the stage of holiness (聖). Then, I may be allowed to say that cheng is a mind or a power not only of humans but also of all other things. Important elements of cheng intentionality can be read out of the two thinker’s various conceptual aspects. YU’s interpretation of history to be internalistic, his view of Hangul(Korean written language) as a revealational medium, his hermeneutics of Christian God as the Vacuum cannot be understood on the dichotomous model of human-nature. HAM’s seed holism, his beliefs that humans’s minds are the heavenly mind and that all things under the heaven should come to be unified are best to be understood on the model of cheng intentionality of integration. (shrink)