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Sense-data are the given elements in our sense experience,
the colors,odors,noises,and pressures of things as they are met in consciousness ;
such sense-data are particulars,not universals.
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Material objects are spatially complete,three dimensional objects ;
but sense-data are spatially incomplete and private,
and they are free from the causal relations which characterize material objects.
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Sense-data which fit together to form solids are said to be constructible,
and solids perceptually constructed within a mediate range of vision in which perfect stereoscopy is possible are said to be constructed from perfectly constructible sense-data.
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The material object,known by reference to constructible sense-data,
has causal properties which could not belong to any family of sense-data ;
consequently,phenomenalism is false.
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