What Jonas tried to transmit to Asher was a memory of the color red and to Lily and his Father he tried to transmit the memory of an elephant. In both cases he is unsuccessful and Asher gets uncomfortable and Lily says he is hurting her. Unlike Jonas they do not have the Capacity to see Beyond and that is why his attempts were unsuccessful.
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BC means before Christ while AD means after the birth of Christ, the one key difference between counting years in BC and AD is when you count time in BC the years decrease as you approach AD on the timeline.
the excavations of the Palace of Knossos