Catholics traditionally hang a crucifix—a cross that includes a representation of Jesus' body (known as the corpus)—rather than an empty cross. This distinction is significant in Catholic spirituality and theology, as the crucifix serves as a reminder of Jesus' sacrifice, His suffering, and the immense love shown through His Passion and death.

Here’s why Catholics specifically choose the crucifix over an empty cross:

1. Focus on the Sacrifice of Christ: The crucifix vividly depicts Jesus’ suffering and death, which are central to Catholic understanding of salvation. Seeing His body on the cross reinforces the belief that Jesus' death was a necessary and redemptive sacrifice for humanity's sins. It serves as a powerful reminder of the depth of God’s love and the cost of our salvation.
2. Encouragement in Suffering: The crucifix also reminds Catholics that Jesus entered into human suffering and knows our pain. By meditating on the crucifix, Catholics find comfort and strength, especially during difficult times, as it encourages them to unite their sufferings with Christ’s.
3. Representation of the Eucharistic Sacrifice: In Catholic theology, the crucifix connects directly to the Mass, where the sacrifice of Jesus is made present. Every time Catholics gather for the Eucharist, they are commemorating Christ's Passion and Resurrection. The crucifix thus becomes a visual extension of this core belief in Jesus' real presence and His sacrificial offering.
4. Distinctive Catholic Identity: The crucifix also reflects a tradition that has been distinctive in Catholic identity for centuries. While both Catholics and many Protestant denominations believe in Christ’s resurrection, Catholics emphasize the importance of remembering the Passion and crucifixion as well.
5. Invitation to Reflection and Prayer: The crucifix is also a devotional aid, helping Catholics to focus on Jesus' humility, obedience, and love. It can lead to deeper meditation, as Catholics are invited to contemplate what Christ endured for humanity.

In sum, Catholics hang a crucifix rather than a simple cross because it serves as a profound reminder of Jesus' sacrifice, His compassion in suffering, and the redemptive love that defines the heart of the Catholic faith. The crucifix, with Christ’s body displayed, continually calls Catholics to remember the cost of salvation and the hope found in the Resurrection.