I argue for the following claims: (1) A core Husserlian account of perceptual constancy needs to be given in terms of indicative future-oriented conditionals but can be complemented by a counterfactual account; (2) thus conceived, constancy is a necessary aspect of content. I speak about a “core Husserlian” account so as to capture certain ideas that Michael Madary has presented as the core of Edmund Husserl's approach to perceptual constancy, viz., that “perception is partly constituted by the continuous interplay of intention and fulfilment” and that this “gives us a way to understand the relationship between different appearances of the same object” (See Madary, M. (2012) “Husserl on Perceptual Constancy.” European Journal of Philosophy 20(1): 145–165.). I take myself to be developing, and perhaps correcting, Madary's view as I discuss the role of the core Husserlian ideas, and counterfactuals, in accounting for shape and color constancy, respectively. I bridge constancy and fulfilment-conditional content by appealing to the Husserlian notion of constitution, which captures the process in which objectivity and, correlatively, intentional experience, are built up in the experiential flow.

中文翻译：

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恒常与宪法

我支持以下主张：（1）需要根据指示性面向未来的条件给出胡塞尔对知觉恒常性的核心解释，但可以通过反事实解释加以补充；(2) 如此设想，恒常性是内容的必要方面。我谈论一个“核心胡塞尔”的解释，以捕捉迈克尔·马德利作为埃德蒙·胡塞尔感知恒常方法的核心提出的某些想法，即“感知部分由意图和实现的持续相互作用构成”和这“给了我们一种方式来理解同一物体不同外观之间的关系”（见Madary , M. (2012) “Husserl on Perceptual Constancy。” European Journal of Philosophy20（1）：145-165。）。当我讨论核心胡塞尔思想和反事实分别在解释形状和颜色恒常性方面的作用时，我认为自己正在发展，也许正在纠正 Madary 的观点。我通过诉诸胡塞尔的宪法概念来连接恒常性和满足条件的内容，该概念捕捉了客观性和相关的有意经验在经验流中建立的过程。