DUPLO is a larger version of LEGO designed for small children ages 1-5. DUPLO bricks are twice the length, width and height of regular LEGO bricks and can be attached to regular LEGO bricks and plates.
In its early days, DUPLO only had bright colored bricks in yellow, red, green, and blue. However in recent years LEGO has added some darker shades to the DUPLO line; colors like tan, dark tan, brown, gray and black.
Why would this be important for adult builders?
Well, besides that DUPLO is cute, it has very useful applications in regular LEGO building.
For example, if you are building a very large creation like a mountain or a large fort, you can incorporate DUPLO to build up the bulk of your project, then ad the smaller details with regular LEGO bricks.
DUPLO colors are the same as the colors of regular LEGO, so they blend in nicely.
DUPLO is a lot cheaper than regular LEGO for its size. This can really help with budgeting for a large project. And because DUPLO’s much larger size, you will need a lot less bricks. Also, the time to build a large-scale design will be reduced greatly.
So, don’t look down on DUPLO as “baby LEGO”! It can grow with you into your adult LEGO building years! 
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I found it hard to find some Duplo building examples, but following site satisfied my needs:
Yeriho, you are welcome to promote your site as long as you meaningfully contribute here.
My boys are already mixing lego and duplo bricks. I like your picture of the various combinations that can be done with the two different size birks. Some of it I was not aware of. Lego did a brilliant job by making these two systems compatible. Duplo will grow into lego! Thanks for the post!
You are welcome, Hayato!
I was wondering what to do with my old duplo! now I know! it will be great for castle building!
I got a bunch of old Duplo from my neighbors for my niece, and I tried to make some kind of space ship just for fun, but I couldn’t come up with any kind of working SNOT technique. You couldn’t fit plates between studs as with regular Lego. Is any SNOT technique even possible using regular Duplo bricks only?
Sorry, for my nephew, I meant…
Hakan, DUPLO is for little kids, so the techniques you can use with them are very basic. However you can attach regular LEGO bricks to DUPLO and do some snotting from there.
I figured as much, but I felt it was cheating…
Thanks, anyway…
LOL! No, no cheating. In fact, there is a LEGO commercial that advertises and encourages the mixing of DUPLO and LEGO. So yeah, it is legal.
Nah… I’m a Duplo purist. I won’t have any Lego elements in my Duplo MOC:s…
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