I don't know if other dance learners also feel the same. However, the first time I was taught the alignments in the Line Dancing (Associate) class, I felt confused.
I had been learning Ballroom Dancing for quite a long time before going for that Line Dancing class. During those ballroom years, I learned that the alignments as LOD, Centre, Wall, Diagonal Wall (DW), and Diagonal Centre (DC) etc.
The LOD is a very important concept in ballroom dancing. LOD, Line of Dance, is an imaginary line drawing around the floor in an anticlockwise direction. The alignments in ballroom is defined in relation to the LOD.
In ballroom dancing, the eight positions is like a compass, placed on a point on the LOD facing the same direction as the LOD. As the dancer moves along the LOD, the centre of the eight points also move along. However the dancer moves, there is only one direction called LOD. When the dancer faces the LOD, the left is always the centre, the the right is always the wall.
In Line Dancing class, the right is just the right side, the left is just the left side. The front is just the front , not the LOD.
The concept Wall means quite differently in line dancing. If we say a dance is one wall, that means after looping one round of the whole dance, the dancer should still face the same direction.
If the dance ends a quarter to either right or left side, the dance is four walls. If it ends opposite the original direction it is two walls.
In this way, there is nothing called three walls dance.
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