From an IFC Fix interview–
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“For each scene I animated about 10 objects at once, frame by frame, including the shadows that move across the shot,” Morris emphasized. “I like my work to be tactile and textured and for my art work to pick up the light in interesting ways.” She used no computer effects whatsoever, but created her own. She added atmosphere by shooting glitter floating in water which when applied to the final cut, create depth and little twinkly floaties that occasionally catch the eye.
Some nicely made making-of films that are sure to develop both a sincere crush and technical interest in the director & artist: