Both Jor-El and Lara preserved some part of their "essence" (in the form of virtual copies of themselves) in the starship that took three years to bring their child to Earth. On Clark Kent's eighteenth birthday, a glowing crystal revealed itself in the ship and compelled Clark to take it north. He eventually reached the Arctic, where the crystal constructed the massive crystalline Fortress of Solitude. Inside, an artificially intelligent hologram of Jor-El appeared to him and initiated twelve years of Kryptonian education. These virtual versions of Jor-El and Lara remained as constructs within the Fortress throughout the series.
Both Jor-El and Lara preserved some part of their "essence" (in the form of virtual copies of themselves) in the starship that took three years to bring their child to Earth. On Clark Kent's eighteenth birthday, a ,glowing crystal revealed itself in the ship and compelled Clark to take it north. He eventually reached the Arctic, where the crystal constructed the massive crystalline Fortress of Solitude. Inside an artificially intelligent hologram of Jor-El appeared to him and initiated twelve years of Kryptonian education. These virtual versions of Jor-El and Lara remained as constructs within the Fortress throughout the series.