This is a realistic model of an hourglass with coins instead of sand.
The model has high precision.
This model consists of primitives and extrusions, parts and materials included.
The model is animated, the coins fall from the dynamics of rigid bodies, coins can be replaced by any objects in its sole discretion.
The hole in the clock between the upper and lower part can be easily made smaller, for this go to clock/glos and add the degree of deformation for example to 95 percent.
Files in 3ds, Max, obj, fbx, cinema 4D version c4d R15.