No shadow on the Interactive whiteboard...

We had an interesting training session on using the interactive whiteboard effectively. There were some wonderful ideas but the most significant thing was that they used an interactive whiteboard which didn't cast a  shadow when anyone approaches the board.  It was an Hitachi data projector. It is  too late for us at the moment,but when a replacement is needed we will certainly be looking for a board that can be used interactively,with ease  by our students!