It sounds like you are describing translucent objects. Translucent materials allow some light to pass through while still blocking a portion of it. This characteristic creates a diffused effect, meaning that while some light comes through, objects on the other side may not be clearly visible. Examples include stained glass windows, frosted glass, and certain types of sunglasses.
There are some objects that let a little light through and they A block B shadow C dark some light at the same time too like stained glass windows or a pair of sunglasses
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