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The height of the 1x1x1 LEGO brick is 6/5 times its width. Is there any particular reason for these proportions? And especially why not making a cubic brick (it would have made SNOT building easier)?

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    In the same line: Why is a plate 1/3 of the brick's height?
    – pcantin
    Nov 4, 2011 at 18:50
  • Probably to simulate real bricks: each of their dimensions are a different length.
    – wersimmon
    Nov 10, 2011 at 23:08

2 Answers 2

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In the 60s, Lego did produce a separate system for architectural modelling called Modulex which used a 1:1 ratio 5mm cube as its basic brick. It wasn't successful and was discontinued in the late 60s.

I believe the 6:5 was chosen so that studs could fit into the geometry. Related: why the plate is 1/3 of the brick's height. By adding two plates to the height of the brick vertically you can now match the centres of two horizontal units (6+2+2):(5+5)

Lego Dimensions

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    Thanks for your answer. Your explanation for the height of a plate is indeed quite convincing. I'm not sure I understand what you mean by studs fitting in the geometry though. Could you please elaborate ?
    – Joel Cohen
    Nov 5, 2011 at 4:10
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    @ghoppe: I'm confused. Didn't the bricks with holes in come years after the plates? Were Lego really planning that far ahead? OTOH, I can't imagine that the geometry you describe is a happy coincidence.
    – Kramii
    Nov 5, 2011 at 8:02
  • From everything I've seen, the geometry is very well thought out and seems to cover all eventualities (or was just very lucky :o)
    – Deanna
    Dec 6, 2011 at 10:18
  • It was a part of an old logo, with the five bands signifying the five 2x2 plates needed to get a 2 brick width.
    – SQB
    Feb 26, 2014 at 11:00
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Thinking Lego started with 2×4 bricks of 1.25 inches. As they made model tractors not from bricks, they made the height of bricks to be equal to the difference between the small and large wheels' centres to build tractors. So (√10 - √2) ÷ 2, but needed to add the size of a stud. Or could just be that 2×4 studs fit the size of a large wheel. In fact 2×4 fits large wheel, but 2×2 overlaps the tyre on small wheel. Slope, 1:1, 100%, 45°, but they have a vertical edge. Guess that = 1/16" & needed to take studs underneath, but not as much as a slimbrick as sloping up from it.

Plates need enough height for studs underneath.

I have some bricks (not compatible with Lego) whose height equals the width of one stud pieces, and whose height is equal to that of 2 plates. I guess a 1/2 Lego plate wouldn't look right for a flat roof, which is their main use?

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