With 'Measure Rhythmic' you can create a rhythm in the blocks you place on linear elements. You can create a rhythm in the scale of the blocks, the block type and/or the distance. For both the scale and distance you can define a list of values. Every time the command will place a block the command will use the next value in the list you defined. So if you defined scales 1.0 2.0 and 3.0 the blocks that are placed are scaled 1.0 2.0 3.0 1.0 2.0 3.0 1.0 and so on. If you want to have a rhythm in the block type you will have to select the blocks in the order you want to have them placed before the command will place the blocks.