> signal lines Good point. I stand corrected. > orientation Two features ensure (and encourage) the block placement at the correct orientation. - layout of

> signal lines Good point. I stand corrected. > orientation Two features ensure (and encourage) the block placement at the correct orientation. - layout of the 4 magnets' polarities at each position (and complementary layout on each Block). - plastic protrusions within the casing (with mating features on each Block). Just an interesting note: The latter also serve to provide a bi-axial constraint on a Block after attachment, to prevent easy detachment. Together with the (neodymium) magnets, they create a very strong hold, important for Blocks like the Soil moisture sensor demo'ed in this video: https://www.youtube.com/watch?v=vwnpbNNyzdQ&list=UU49EYw900LZn5VBglLRzxHw https://www.youtube.com/watch?v=vwnpbNNyzdQ&list=UU49EYw900L...