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The LEGO 2x4 brick is somewhat of an icon of LEGO, and the majority of official LEGO bricks can connect back to it. However, the number of bridging bricks required can vary, depending on the piece. Some pieces, like a 1x1 Round Tile, can be connected directly to it; however, others, like the Technic Axle 32, require additional pieces (in this case, the Technic Brick 1 x 2 with Axle Hole) to bridge the gap.

The piece I can think of that requires the most of said bridging pieces to connect back to a 2x4 is the body of the Bohrok Canister assembly, which requires 4 pieces to reach the 2x4: the lid, the hanger clip, a Bohrok ribcage, and a 1x2 Brick With Pin. My challenge is, can you do me one better? What piece takes the most bridging pieces to connect back to a standard 2x4, and what is the chain required for it?

Rules:

  • The piece must be official LEGO; no messing around with off-brand pieces with absurd new connection types.
  • All connections used must be legal; no strapping things together with rubber bands and calling it good (that would take all the fun out of it).
  • There must actually be a method of connecting the pieces together; pieces like the ball used in Scorpion Palace or any of the BIONICLE canisters without built-in studs are just cheating.
  • This might actually be a good puzzle for Puzzling.SE, but you already posted it here, so. – SMS von der Tann Aug 17 '16 at 23:40
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    I feel like puzzling is more about wordplay or math tricks than physical stuff. – Caleb Woodman Aug 17 '16 at 23:45
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    This is a nice break from the usual "what is this obscure part" -- no problem with this IMHO. – Mark Stewart Sep 16 '16 at 0:05
  • I suggest that you post your best solution as a separate answer (possibly with pictures), so it can be separately commented and voted upon. – Wrzlprmft Nov 12 '16 at 11:29
  • @Wrzlprmft Sadly, I no longer have any of the original Bohrok canisters. However, physical construction of the winning chain isn't necessarily a requirement; this is more a parts knowledge test than a supply one. – Lepidolite Mica Nov 21 '16 at 3:15
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Thornax, 7 connections.

This is just a start, but here's a 2x4 connection to a BIONICLE thornax.

enter image description here

BIONICLE Ball, 6 connections

The extra two pieces are needed to hold the ball in place, making it truly connected.

enter image description here

  • Ooh. Sorry, but this brick and a 4 axle can bring the Thornax down to a 4-piece chain, and it can be used with the Zamor sphere as well. You're on the right track, though! – Lepidolite Mica Aug 18 '16 at 2:53
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Technic chain links and conveyor-belt links (a.k.a. bulldozer chain links) connect to nothing except each other (as far as I know). (The large chain link with studs has larger connections, at least in LDraw.)

However, once you have eight of them, you can wrap them around a standard 16-cog gear. (You can also wrap six of them around an 8-cog gear, but I would not consider that a robust and intended connection.)

Finally, the gear can be connected to a length-3 axle with stud, which in turn can be connected to the bottom of the 2×4 brick.

For bulldozer chain links, this looks like this:

Parts

Construction

Now, it depends on how you interpret the challenge: You need nine other pieces to connect the a chain link with the 2×4 brick. However, many of those pieces are again chain links and there are only two pieces between every chain link and the 2×4 brick.

  • I'm terribly tempted to give it to you... I'm just trying to figure out whether connecting those links to standard rods is legal. If it is, a 1x4 antenna drops the chain down to one link. – Lepidolite Mica Nov 13 '16 at 3:52

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