I like the idea of this effect and the handling is very easy yet the effect itself is highly visual.
The problem I have with this trick is the ending which shows 4 coins with blue on one side and black
on the other side. This is not consistently as to the previous phases of the routine which seems to
change coins from one color to another and the audiences are assuming that the coins have the same
color on both sides. This is why I do not do the last phase of this effect.