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The sensible furniture by which the spatial conceptions of the blind are denoted obviously cannot be visual, and are no doubt largely tactual, whilst on the other hand the vident utilise the visual data to the almost total exclusion of any other.
Nam qui aut tempus quid postulet, non videt, aut plura loquitur, aut se ostentat, aut eorum quibuscum est vel dignitatis vel commodi rationem non habet, aut denique in aliquo genere aut inconcinnus aut multus est, is ineptus esse dicitur. Hoc vitio cumulata est eruditissima illa Graecorum natio. Itaque quod vim hujus mali Graeci non vident, ne nomen quidem ei vitio imposuerunt.
Diderot attempts to solve the problem by maintaining that tactual sensations occupy an extended space which the blind in thought can add to or contract, and in this way equip himself with spatial conceptions. There would, on this view, as M. Villey remarks, be a complete heterogeneity between the imagination of the blind and that of the vident. M. Villey denies this altogether.
Arist. de insomn. cap 3. Quae in vita usurpant homines, cogitant, curant, vident quaeque agunt vigilantes, agitantque, ea cuique in somno accidunt. De Div. Essay on Human Understanding, book, chap. i. sect 17. Obs, on Man, vol. 1, sect. 5. There is a phenomenon in the mind, which, though it happen to us while we are perfectly awake, yet approaches the nearest to sleep of any I know.
Mox vehiculum et vestes, et, si credere velis, numen ipsum secreto lacu abluitur. Servi ministrant, quos statim idem lacus haurit; arcanus hinc terror sanctaque ignorantia, quid sit illud, quod tantum perituri vident. XLI. Et haec quidem pars Suevorum in secretiora Germaniae porrigitur.
Indeed, it will perhaps not be disputed that the ordinary vident man derives from the sensations of vision his most common spatial conceptions. We propose, therefore, to inquire very briefly how the character of spatial extension becomes associated with the data of Vision.
Sed assiduitate quotidiana et consuetudine oculorum assuescunt animi, neque admirantur neque requirunt rationes earum rerum, quas semper vident, perinde quasi novit as nos magis quam magnitudo rerum debeat ad exquirendas causas excitare. SECT. IV. All Nature shows the Existence of its Maker. But, after all, whole nature shows the infinite art of its Maker.
Individual quotations would only detract from the cumulative effect of his argument, but we may refer in particular to the interesting discussion as to the relations between the space concepts of the blind and those of the vident. The blind can be taught, and are taught, geometry, and can discuss and understand spatial and geometrical problems.
A deep silence reigns behind this curtain; no one who passes beyond it answers any questions; all the reply is an empty echo, like the sound yielded by a vault. "Sooner or later all must go behind this curtain, and they approach it with fear and trembling, in doubt who may be waiting there behind to receive them; quid sit id, quod tanturn morituri vident.
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