Play with the ideas
before you study them.

The convnet as a living diagram: draw a digit, watch 56 feature maps light up across three blocks, and open any map to see the exact convolution behind it.

Hand-edit a 3×3 convolution kernel and watch it filter real photos live — a cat, a rocket, a temple, or any image you upload — then probe a single pixel to see the 9 products sum into it, or scan the window building the whole output.