Artificial illumination device for generating natural light similar to that from the sun and the sky, which comprises a direct-light source (12) configured to produce a direct light in a direct-light direction (32), the direct-light source comprising a plurality of pairs of a first light-emitting device (14; 60) and a collimator (16; 64) configured to collimate the light emitted by the first light-emitting device along the direct-light direction (32); and a diffused-light generator (10) configured to cause diffused light (35). The direct-light source and the diffused-light generator co-operate to form outer light which comprises a first light component which propagates within a low divergence cone along the direct light direction and a second light component which propagates along directions outside the low divergence cone. The first light component has a correlated color temperature CCT which is lower than a CCT of the second light component, so that an observer sees a bright spot (40) corresponding to the sun surrounded by a bluish background which mimics the sky.
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