A Long, Dark Shadow

2021 ◽  
Author(s):  
Allyn Walker
Keyword(s):  
2021 ◽  
Vol 13 (1) ◽  
pp. 59-75
Author(s):  
Henrik Boman

This article concerns the distribution of fire as light and heat source within the insula investigated by the ongoing Swedish Pompeii Project. Here the author suggests that fire installations as kitchens, ovens and baths were clustered in specific areas within this insula, and the installations were not efficiently used to heat the dwelling areas of the house. It is also proposed that the surfaces of the interior walls and floors of the Roman atrium house were polished in purpose to reflect and distribute light and, which is emphasised in the article, to soften the transition between brightly lit areas and areas in dark shadow. This contrast had to be eliminated for the human eye to adopt to the light conditions in the room and by that, to make the light as efficient as possible.


2021 ◽  
Author(s):  
ALLYN WALKER
Keyword(s):  

Perception ◽  
1981 ◽  
Vol 10 (5) ◽  
pp. 563-572 ◽  
Author(s):  
J Timothy Petersik ◽  
Melinda McDill

A display was devised for the purpose of studying the information afforded by kinetic optical occlusion (the progressive erasure and replacement of static elements within a display). A microcomputer generated a series of equally spaced light bars on a dark background. The first bar on the left was suddenly blanked and, after a pause of variable duration (an interblank interval, or IBI), was replaced. As the first bar was replaced, the second bar in the series was blanked, and so on, until each bar in the pattern had been blanked and replaced. Depending upon the duration of the IBI, this display gave rise to one of two alternative percepts: the observer either saw movement of a dark shadow ‘in front of’ the pattern of bars (with IBIs ≲ 50 ms) or he saw right-to-left stroboscopic movement of successive bars (with IBIs ≳ 85 ms). At some intermediate IBI (the transition IBI) the display was bistable. A two-bar variant of the original display was also studied and found to be bistable under appropriate conditions. In a series of experiments it was found that the transition IBI for the original display did not depend upon whether the observer was tracking the sequence of events or fixating a stationary point in the display. The transition IBI was an increasing function of spatial frequency above about 3 cycles deg−1, and depended upon whether the display was focused or optically blurred. Empirically determined transition IBIs correspond well to estimates of the integration times of visual mechanisms studied in other paradigms.


2019 ◽  
Vol 6 (2) ◽  
pp. 101-106
Author(s):  
Pablo Muchnik

By “evil,” Kant does not designate any set of particularly pernicious acts, but the type of volition that underlies and makes possible immorality in all its forms. The evil person, Kant believes, “makes the incentives of self-love and their inclinations the condition of compliance with the moral law –whereas it is the latter that, as the supreme condition of the satisfaction of the former, should have been incorporated into the universal maxim of the power of choice as the sole incentive” (R 6:36). This inversion of the ethical order of priority does not entail the repudiation of “the moral law (…) in rebellious attitude (by revoking obedience to it)” (R 6:36), but its conditional respect. This fraudulent relation to morality is based on complex strategies of deception, self-deception, and rationalization. The “radical “nature of these tendencies has nothing to do with the intensity or magnitude of observable wrongdoing. Evil’s radicalism is a spatial metaphor intended to designate the locus of immorality (its “root”) in an agent’s “disposition (Gesinnung). What is most baffling the Kantian view is that evil so construed is perfectly compatible with good conduct. Indeed, under the conditions of civilization, Kant believes, it is impossible to distinguish a man of good conduct from a morally good man (RGV 6:30), for the dictates of self-love generally overlap with the prescriptions of duty. The persistence of war, poverty, oppression, and the infinity of vices which cast a dark shadow over the contemporary world speak of the prescience of the Kantian approach.


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