Building blocks are a multi-dimensional cultivation of interest, play and creativity, imagination and cooperation. If your child also likes building blocks, then you must cultivate him well. What I bring to you today are the fixed principles for building large blocks, suitable for children over 3 years old. 1.Interlocking structure The gaps between the upper and lower floors lock with each other, making the entire structure stronger and less likely to collapse. 2.Single point interlocking The upper and lower parts are made of interlocking building blocks, making the entire structure sinuous and stretchable. Common ones are building tentacles, tails, cylindrical buckets, etc. 3.Three-dimensional interlocking one-step The gaps between the upper and lower floors are interlocking and rise in steps, making the entire structure more diffuse and extended. Commonly used to build extensions, stairs, etc. 4.Three-dimensional interlocking - corner type The gap...