In this example, Block A contains a cylinder and a box. If By Parent is selected in the properties of a block member, the properties will be controlled by the block instance. A block instance is the parent of its block members. Think of a block instance as a container that contains objects (block members). This option is only useful for objects in blocks. Grouped objects will not maintain their grouped status inside a block. If a block has objects that are on the locked layer, but the block instance insertion point is not on that layer, the object itself is not locked because the controlling factor is the layer of the block insertion point. When you lock a layer, only the layer that contains the insertion point of the block instance is locked. However, if the layer the block instance is inserted on is turned off, all of the objects will disappear. When the block contains objects on a specific layer, turning that layer off will turn off only the objects on that layer. For example, the block geometry does not change to match the layer color onto which the block instance is inserted. There is no relationship between the block instance's layer and the geometry contained in the block. Block instances that you insert to the model insert onto the current layer and can be moved to any other layer. The properties of the geometry (curves, surfaces, etc.) that are contained in the block instance are controlled either by the layer properties or object properties of the geometry itself.
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