thanks for this guys your tutorial helped alot

To toggle between areas with the map, he used
/clear @p[xyzr-numbers] 358
run on a rapid clock.

358 is the block ID for a filled-in map. Once that command block activates, it provides a comparator output and teleports the player to the flipped copy of the map. The comparator output also triggers /give @p 395

395 is the ID for an empty map.

I think in his video Seth had a T-flip flop. That would toggle between which command blocks were active; there were two rows of command blocks for each area. When any command block triggers, it would toggle so that the other row of command blocks had to be activated.

I don't know how good that was of an explanation. Oh well. Play around and see if you can get it.

The way he did it was be using a command block that teleports the player to an identical flipped map, by using a trigger, which runs the command for example: /tp @p ~5 ~ ~5, so that will teleport you +5 blocks in both the x and z coordinates.

Hoped this helped, if you need any more help, just say something on this post to summon me.