Eurorack sequencers are pretty plentiful, with many new and innovative ideas and incarnations of the idea. This particular one uses Lego bricks to sequence four 16 step patterns, with 16 patch memories and mutes for each track - where each brick triggers a hit from one of four outputs. Details are as follows:
It's a neat idea for music making in a tactile way and possibly a nice entry point for kids who might be interested in alternative uses for their colourful bricks. The makers Atonal have mentioned that "Although the stud detection algorithm is quite strong, this is working with light so: flashing lights or low light environment will produce unexpected results".
More details are available on their website.