<p>The part is <a href="https://rebrickable.com/parts/4190/plate-special-2-x-2-with-double-inverted-curve-1-stud/" rel="noreferrer">Plate Special 2 x 2 with Double Inverted Curve, 1 Stud (4190)</a>.</p>
<p><a href="https://i.sstatic.net/CVXIY.png" rel="noreferrer"><img src="https://i.sstatic.net/CVXIY.png" alt="Part render" /></a></p>
<p>It was introduced in a few sets in 2023. It's original use was to provide an upward curve on roofs. This can be seen very easily in <a href="https://rebrickable.com/sets/21060-1/himeji-castle/" rel="noreferrer">Himeji Castle (21060)</a>:</p>
<p><a href="https://i.sstatic.net/0Iyvz.png" rel="noreferrer"><img src="https://i.sstatic.net/0Iyvz.png" alt="Himeji Castle" /></a></p>
<p>It can of course be used for many other things. Trivially, these parts can be tiled to create small peaks in a 4x4 area:</p>
<p><a href="https://i.sstatic.net/pckNX.png" rel="noreferrer"><img src="https://i.sstatic.net/pckNX.png" alt="4x peak" /></a></p>
<p>These parts are also compatible with some of the other recent inverted curved slope elements. For example, here it is next to <a href="https://rebrickable.com/parts/73682/brick-curved-internal-double-3-x-3-with-13-inverted-cutout-corner/" rel="noreferrer">Brick Curved, Internal Double, 3 x 3 with 1/3 Inverted Cutout, Corner (73682)</a>:</p>
<p><a href="https://i.sstatic.net/uPki5.png" rel="noreferrer"><img src="https://i.sstatic.net/uPki5.png" alt="Profile comparison 3x3 Curved Slope Double 73682" /></a></p>
<p>This is the same profile as <a href="https://rebrickable.com/parts/70681/brick-curved-3-x-1-with-13-inverted-cutout/" rel="noreferrer">Brick Curved, 3 x 1 with 1/3 Inverted Cutout(70681)</a>:</p>
<p><a href="https://i.sstatic.net/8ABEQ.png" rel="noreferrer"><img src="https://i.sstatic.net/8ABEQ.png" alt="Profile comparison 1x3 Arch Inverted 70681" /></a></p>
<p>This curve also aligns perfectly with the curve of the <a href="https://rebrickable.com/parts/93273/slope-curved-4-x-1-double-with-no-studs/" rel="noreferrer">telephone bow</a>, assuming that is can be inverted:</p>
<p><a href="https://i.sstatic.net/v1ZMy.png" rel="noreferrer"><img src="https://i.sstatic.net/v1ZMy.png" alt="93273 render" /></a></p>
<p>Here's one way those parts can be used together:</p>
<p><a href="https://i.sstatic.net/T388K.png" rel="noreferrer"><img src="https://i.sstatic.net/T388K.png" alt="Telephone bow compatibility" /></a></p>
<p><a href="https://i.sstatic.net/a8zlq.png" rel="noreferrer"><img src="https://i.sstatic.net/a8zlq.png" alt="Telephone bow front" /></a></p>
<p>Because the telephone lines up with a pair of these, the <a href="https://rebrickable.com/parts/11477/slope-curved-2-x-1-no-studs-12-bow/" rel="noreferrer">2x1 bow slope</a> also lines up easily:</p>
<p><a href="https://i.sstatic.net/IGjSb.png" rel="noreferrer"><img src="https://i.sstatic.net/IGjSb.png" alt="11477 Render" /></a></p>
<p>The notched variant (29119/29120) of those slopes are also compatible:</p>
<p><a href="https://i.sstatic.net/FIa0D.png" rel="noreferrer"><img src="https://i.sstatic.net/FIa0D.png" alt="29119" /></a>
<a href="https://i.sstatic.net/ZTcBy.png" rel="noreferrer"><img src="https://i.sstatic.net/ZTcBy.png" alt="29120" /></a></p>
<p>In fact, those parts can be used to fill both sides of this part at once:</p>
<p><a href="https://i.sstatic.net/jziBD.png" rel="noreferrer"><img src="https://i.sstatic.net/jziBD.png" alt="Corner with 29119/29120" /></a></p>
<p>There are plenty of ways to use this part, either by integrating with other slopes, or arranging it using SNOT techniques. For example, here's a quick window that I made to demonstrate how these can be combined to create a nearly circular outline:</p>
<p><a href="https://i.sstatic.net/snA84.jpg" rel="noreferrer"><img src="https://i.sstatic.net/snA84.jpg" alt="Window design" /></a></p>

CC BY-SA 4.0
2024-01-15T16:53:22.790Z
2024-01-15T16:53:22.790Z
jncraton
<p>I recently came across this LEGO part:</p>
<p><a href="https://i.sstatic.net/qlnW8.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/qlnW8.png" alt="Part photo" /></a></p>
<p>What part is this? What can it be used for?</p>

<part-identification><piece-information><piece-usage>
What is this 2x2 part with one corner curved up?
jncraton
# What is this 2x2 part with one corner curved up?

(Asked by: username_0 on 2024-01-15)

I recently came across this LEGO part:

[![Part photo](https://i.sstatic.net/qlnW8.png)](https://i.sstatic.net/qlnW8.png)

What part is this? What can it be used for?

**Tags:** part-identification, piece-information, piece-usage


---

## 1 answers

### Answer by username_0 on 2024-01-15. Score: 9

The part is [Plate Special 2 x 2 with Double Inverted Curve, 1 Stud (4190)](https://rebrickable.com/parts/4190/plate-special-2-x-2-with-double-inverted-curve-1-stud/).

[![Part render](https://i.sstatic.net/CVXIY.png)](https://i.sstatic.net/CVXIY.png)

It was introduced in a few sets in 2023. It's original use was to provide an upward curve on roofs. This can be seen very easily in [Himeji Castle (21060)](https://rebrickable.com/sets/21060-1/himeji-castle/):

[![Himeji Castle](https://i.sstatic.net/0Iyvz.png)](https://i.sstatic.net/0Iyvz.png)

It can of course be used for many other things. Trivially, these parts can be tiled to create small peaks in a 4x4 area:

[![4x peak](https://i.sstatic.net/pckNX.png)](https://i.sstatic.net/pckNX.png)

These parts are also compatible with some of the other recent inverted curved slope elements. For example, here it is next to [Brick Curved, Internal Double, 3 x 3 with 1/3 Inverted Cutout, Corner (73682)](https://rebrickable.com/parts/73682/brick-curved-internal-double-3-x-3-with-13-inverted-cutout-corner/):

[![Profile comparison 3x3 Curved Slope Double 73682](https://i.sstatic.net/uPki5.png)](https://i.sstatic.net/uPki5.png)

This is the same profile as [Brick Curved, 3 x 1 with 1/3 Inverted Cutout(70681)](https://rebrickable.com/parts/70681/brick-curved-3-x-1-with-13-inverted-cutout/):

[![Profile comparison 1x3 Arch Inverted 70681](https://i.sstatic.net/8ABEQ.png)](https://i.sstatic.net/8ABEQ.png)

This curve also aligns perfectly with the curve of the [telephone bow](https://rebrickable.com/parts/93273/slope-curved-4-x-1-double-with-no-studs/), assuming that is can be inverted:

[![93273 render](https://i.sstatic.net/v1ZMy.png)](https://i.sstatic.net/v1ZMy.png)

Here's one way those parts can be used together:

[![Telephone bow compatibility](https://i.sstatic.net/T388K.png)](https://i.sstatic.net/T388K.png)

[![Telephone bow front](https://i.sstatic.net/a8zlq.png)](https://i.sstatic.net/a8zlq.png)

Because the telephone lines up with a pair of these, the [2x1 bow slope](https://rebrickable.com/parts/11477/slope-curved-2-x-1-no-studs-12-bow/) also lines up easily:

[![11477 Render](https://i.sstatic.net/IGjSb.png)](https://i.sstatic.net/IGjSb.png)

The notched variant (29119/29120) of those slopes are also compatible:

[![29119](https://i.sstatic.net/FIa0D.png)](https://i.sstatic.net/FIa0D.png)
[![29120](https://i.sstatic.net/ZTcBy.png)](https://i.sstatic.net/ZTcBy.png)

In fact, those parts can be used to fill both sides of this part at once:

[![Corner with 29119/29120](https://i.sstatic.net/jziBD.png)](https://i.sstatic.net/jziBD.png)

There are plenty of ways to use this part, either by integrating with other slopes, or arranging it using SNOT techniques. For example, here's a quick window that I made to demonstrate how these can be combined to create a nearly circular outline:

[![Window design](https://i.sstatic.net/snA84.jpg)](https://i.sstatic.net/snA84.jpg)


---

