Abstract: In an embodiment, ice tray assembly includes a housing, a bottom tray, a top ice tray, middle layer and latches. The housing includes an open side, and the bottom tray is adapted to be disposed within housing. Top ice tray is disposed over bottom ice tray within housing. Top ice tray includes first plurality of mold cells for forming clear ice shapes. Each mold cell includes open top end and open bottom end. Middle layer is adapted to be sandwiched between bottom tray and top ice tray. Middle layer includes plurality of perforations to pass free flowing oxygen from top ice tray to bottom tray. Latches are coupled with bottom tray and top ice tray, to hold them together within housing. Clear ice shapes are produced in mold cells when free flowing oxygen from top ice tray passes to bottom tray through plurality of perforations of the middle layer.