One of the earlier elements of the LEGO® Modulex system was the architectural profile brick. There were several sizes and the details are interesting to review. One style of the brick had a stud on top, an open side, and an open bottom. You can see each of the three sides has a different texture: smooth, shutters, or vertical bars. There are 2 different height versions of this style of profile element: 4 brick height and 5 brick height.
![](https://minibricksmadness.com/wp-content/uploads/2023/04/modulex_profilebrick3-690x597.jpg)
The other main type of profile brick is horizontal in orientation. There are 4-stud, 5-stud, 6-stud, and 7-stud versions. These bricks have a different texture on each side (so, two options).
![](https://minibricksmadness.com/wp-content/uploads/2023/04/modulex_profilebrick1-690x743.jpg)
There were four colors available: Black, Brown, White, and Grey. When the LEGO® Modulex direction changed from architectural rendering to plan boards, the element was no longer available. Notice that the studs have the earlier LEGO® marking (later bricks have M).
![](https://minibricksmadness.com/wp-content/uploads/2023/04/modulex_plasticbox-690x416.jpg)
I actually really like these Pprofile bricks. I recently purchased one of those M20 paper boxes that included all of the different sizes in brown. Seems like those are more widely available than the other colours.