In the Eastertide narrative, today marks Ascension Day, forty days after Jesus’ resurrection and ten days before Pentecost.  Erik Varden reflects well on the day in Entering the Twofold Mystery when, using Luke’s account of the moment in the book of Acts, he draws a parallel between God’s presence and guidance via cloud in the Old Testament (especially in connection with the Exodus, the Tabernacle, and the Temple.  He writes:

On Ascension Day, Christ does not disappear beyond earth’s orbit.  He enters the glory of the Father whereof the earth is full.  He effectively fulfills his promise not to leave us as orphans.  To apprehend this new mode of Jesus’ presence among us, special grace is called for.  We need the Counselor, the Caller-to-mind, who will be our source of strength.  Christ promises to send him ‘soon’.  Throughout Eastertide we have verified that what he says is sure.  This word, too, will be fulfilled.  Like the apostles, then, let us savour Christ’s Ascension ‘full of joy’, waiting with eager expectation for the Father’s promise of Pentecost.

On another level, or in another way to commemorate the day, here’s U2’s “Window in the Skies.”